Computer Security

**This is a ticketed event. Please register at [this link](https://luma.com/wbpv7ouu).** In this talk, Talha Paracha will present insights from his latest research on using language models for improving software security ("Hallucinating Certificates", to appear at ICSE 2026). Certificate validation is a crucial step in Transport Layer Security (TLS), the de facto standard network security protocol. Prior research has shown that differentially testing TLS implementations with synthetic certificates can reveal critical security issues, such as accidentally accepting untrusted certificates. Paracha et al. introduce a new approach, MLCerts, to generate synthetic certificates that leverages generative language models to more extensively test software implementations. Recently, these models have become (in)famous for their applications in generating content, writing code, and conversing with users, as well as for "hallucinating" syntactically correct yet semantically nonsensical output. The authors leverage two novel insights in their work: (a) TLS certificates can be expressed in natural-like language, namely in the X.509 standard that aids human readability, and (b) differential testing can benefit from hallucinated malformed test cases. MLCerts finds significantly more distinct discrepancies between the five TLS implementations OpenSSL, LibreSSL, GnuTLS, MbedTLS, and MatrixSSL than the state-of-the-art benchmark Transcert. ​​​**Event Schedule** 6:00 to 6:30 - Food and introductions 6:30 to 7:30 - Presentation and Q&A 7:30 to 9:00 - Open Discussions ​​​​​​If you can't make it in person, feel free to join the live stream starting at 6:30 pm, via [this link](https://www.youtube.com/@Trajectory-Labs/live).

\*\*Please note that this event requires your name and email address for QR code to get access to the building on the event day, you must register or else you will not receive a QR code for access\*\* [Link ](https://forms.office.com/r/7ZB00rZmBh?origin=lprLink)to Registration: https://forms.office.com/r/7ZB00rZmBh?origin=lprLink Agenda: Join us for the **GitHub Copilot Dev Days** event in Toronto! ​Whether you use VS Code, or any other tool in your stack, this session is GitHub‑centric but fully tool‑agnostic — come as you are, code how you like. **Sponsors:** -Microsoft -Lantern ​**What to Expect** * ​Practical insights into real GitHub workflows and modern AI‑assisted development * ​Live demos from local engineers and community builders * ​A friendly, social environment to connect, share ideas, and learn from one another **Speakers:** -Bruno Capuano \- Cihan Cinar \- Kaan Turgut -Ehsan Eskandari

**Note the location Thai Express Union Station food court.** **Google pin.** [https://share.google/grUYGncv3G3exetw7](https://share.google/grUYGncv3G3exetw7) **We will discuss day trading, swing trading strategies and tools.** This will not be a presentation format. **Telegram group for quicker communication:** [https://t.me/+m8BMRABGX74xNmZh](https://t.me/+m8BMRABGX74xNmZh) **Discord Group for exchanging ideas, charts and strategies** [https://discord.gg/SVYTSPh7](https://discord.gg/SVYTSPh7) We will discuss options trading and investing strategies, as well as the skills needed to start. It is a **casual meetup to meet people who are interested in trading or building a career around it, especially algorithmically. No "financial gurus" are welcome.** Join us for a meetup where we share trading ideas, and connect with others who share a common interest in investing. Algorithmic trading is commonly used by large institutional investors and market makers, but it is also accessible to retail traders. It offers several advantages over manual or discretionary approaches—particularly in minimizing psychological errors that often impact human traders. Some of the topics we usually discuss: \- Reasons for investing \- Limitations of being a retail trader \- Practical tools: brokers\, APIs\, data sources\, real\-time implementation \- Brainstorming ideas: strategies that may be working today **Note this even is not sponsored or endorsed by any business where we are meeting. We are just using their space for casual meetup event.** **Please no promotion of MLM, pyramid schemes, self promotion to paid services, affiliate promotion, paid subscriptions or similar stuff.** **Useful Links** * Notion page of [Algo Trading Resources](https://systemetic.notion.site/Algorithmic-Trading-Resources-fe400c5258e440fd8a4d63770d08bc13) **Disclaimer:** This meetup is for educational and informational purposes only and should not be construed as professional financial advice. The discussions and materials presented at this meetup are provided as general information and are not intended to be a substitute for professional financial, legal, or tax advice. All participants are encouraged to consult their financial advisor or qualified professionals regarding specific financial issues. None of the organizers, speakers, or participants at this meetup are liable for any financial loss or damage incurred as a result of trading activities or decisions based on the information shared during this event. Trading stocks and other financial instruments involves risk and may not be suitable for all individuals. **CFTC Rule 4.41:** Futures, foreign currency and options trading contains substantial risk and is not for every investor. An investor could potentially lose all or more than the initial investment. Risk capital is money that can be lost without jeopardizing one’s financial security or lifestyle. Only risk capital should be used for trading and only those with sufficient risk capital should consider trading. Past performance is not necessarily indicative of future results. **Non-Endorsement**: References to specific securities, investment strategies, or any financial instruments during the meetup are for illustrative purposes only and do not constitute a recommendation, endorsement, or investment advice by the organizers or speakers. **No Guarantees**: There is no guarantee that the investment strategies discussed will be profitable or protect against loss. All investments involve the risk of loss. **Conflict of Interest**: Presenters or organizers may hold or intend to acquire positions in securities discussed during the meetup, which may create a conflict of interest.

Eventbrite Link: **[https://www.eventbrite.ca/e/769799319487?aff=oddtdtcreator](https://www.eventbrite.ca/e/769799319487?aff=oddtdtcreator)** **Midweek Laughs Unleashed! Join us every Wednesday at 10 PM for the hottest stand-up comedy in Toronto. Don't miss the fun!** Unleash midweek euphoria! Dive into the heart of Toronto's vibrant comedy scene every Wednesday at 10 PM. Immerse yourself in an evening of uproarious laughter, spotlighting the city's top comedic talents. Backroom Comedy Club sets the stage for an unforgettable midweek escapade. Secure your spot now and be part of the laughter revolution!

Modern Microsoft Fabric projects often start with built‑in Git integration and deployment pipelines—but at enterprise scale, those capabilities alone are rarely sufficient. As environments grow in size and complexity teams need more advanced tools and patterns to manage Fabric artifacts reliably across development, test, and production. In this session, we will: \- Review common enterprise lifecycle challenges in Microsoft Fabric \- Introduce advanced DevOps tooling and automation patterns used to address them \- Walk through a realistic implementation pattern that shows how these tools fit together in practice This session is designed for data and platform engineers and architects responsible for operating Microsoft Fabric in production. If you’re already using Git integration and deployment pipelines and are looking to extend them with more scalable, repeatable, and enterprise‑ready CI/CD practices, this session will help you understand when and how to go beyond the defaults. *Come at 5:30 pm have some pizza and chat for a bit. The presentation starts at 6:00 pm.*

Please contact event host, Christopher, for the event location at christopher.tyrrell@ymail.com

Instructions on developing breath as in yoga and Zen - increasing health, calmness and happiness. Lots of time for tea and conversation too. Please note - this meetup will only run with a minimum of 7 ppl and will be automatically re-scheduled 'till the following week if less than 6 ppl RSVP. Blessings! GJ

Let’s do some coding together at a cafe! No more working alone in the weekend. Here, we write code together. And I mean together together. Not occupying-the-same-space-but-separate together. Here’s how it works: Jennifer brings her mobile app project, tells everyone that it is like Pinterest for recipes and she’d like to work on the nav bar. Paul and Chloe think Jennifer's project is fascinating, and they join the group. They gather around Jennifer’s laptop and work on the nav bar for 2 hours. Jennifer is the one typing out the code while Paul and Chloe research, brainstorm, and offer suggestions. If you’re feeling stuck on your own project or need a motivation boost, bring it to mob programming! Want to learn by watching how others code and solve problems? Join someone else’s project at this event! Oh and we love your half-done projects that you are a bit embarrassed to share. Absolutely bring those to the event! **Discord**: We use Discord to share screen & code snippets during the event. Also feel free to share your projects here before the event! https://discord.gg/yvAGbh4PpD **Event policy**: * We have 0 tolerance for harassment. * We don’t allow the projects that are not meant to be shared in public such as school assignments, interview tasks, or trade secrets. * The goal is to write code. We discourage you from pitching business ideas here, doing code reviews, or spending the whole event on planning what to do. * Please buy a drink, and tip the barista well.

A diffuse harm hurts many people a little; a concentrated harm hurts one person a lot. Other things equal, diffuse harm seems less bad than its concentrated counterpart. For example, shortening a billion happy lives by a second each seems less bad than shortening one happy life by a billion seconds (\~30 years). But this attractive thought is surprisingly difficult to maintain. Although many problems for such a view are known, a particularly vivid difficulty arises in cases that involve a sequence of social positions, each very similar to the last, such as the Fortuna’s Wheel scenario. In such cases, it follows, from rather minimal assumptions, that diffuse harm is just as bad as its relevantly similar concentrated counterpart. In response, some may wonder whether the parity of diffuse and concentrated harms holds only in these special sequential cases. But it can be argued that the approximate parity of diffuse and concentrated harms extends well beyond such cases. Specifically, it can be argued that in many realistic cases, a diffuse harm will bring about an outcome approximately as bad as a relevantly similar concentrated harm. Diffuse harm is easily underestimated. Zach Barnett https://philosophy.nd.edu/people/faculty/zach-barnett/ Assistant Professor Department of Philosophy University of Notre Dame **About the Speaker:** Zach received his PhD from Brown University in 2018. He joined Notre Dame in 2023, moving from the National University of Singapore, where he taught for five years. Zach mainly studies ethics, practical rationality, and epistemology, and he hopes that his work is convincing, surprising, and easy to understand. Current research interests include collective action problems, aggregation and risk, and followability of norms. His representative publications include "Rational Moral Ignorance" (2021) in *Philosophy and Phenomenological Research*, "Why You Should Vote to Change the Outcome" (2020) in *Philosophy & Public Affairs,* "Philosophy Without Belief" (2019) in *Mind*, and "No Free Lunch: The Significance of Tiny Contributions" (2018) in *Analysis*. **\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*** This is a talk with audience Q&A presented by the University of Toronto's Centre for Ethics that is free to attend and open to the public. The talk will also be streamed online with live chat here [to be posted]. About the Centre for Ethics (http://ethics.utoronto.ca): The Centre for Ethics is an interdisciplinary centre aimed at advancing research and teaching in the field of ethics, broadly defined. The Centre seeks to bring together the theoretical and practical knowledge of diverse scholars, students, public servants and social leaders in order to increase understanding of the ethical dimensions of individual, social, and political life. In pursuit of its interdisciplinary mission, the Centre fosters lines of inquiry such as (1) foundations of ethics, which encompasses the history of ethics and core concepts in the philosophical study of ethics; (2) ethics in action, which relates theory to practice in key domains of social life, including bioethics, business ethics, and ethics in the public sphere; and (3) ethics in translation, which draws upon the rich multiculturalism of the City of Toronto and addresses the ethics of multicultural societies, ethical discourse across religious and cultural boundaries, and the ethics of international society. The Ethics of A.I. Lab at the Centre For Ethics recently appeared on a list of 10 organizations leading the way in ethical A.I.: https://ocean.sagepub.com/blog/10-organizations-leading-the-way-in-ethical-ai

Eventbrite Link: **[https://www.eventbrite.ca/e/694505453507?aff=oddtdtcreator](https://www.eventbrite.ca/e/694505453507?aff=oddtdtcreator)** **Get groovy with Funky Fridays! Toronto's comedy party starts at 8 PM. Unwind, laugh, and kick off your weekend in style!** Dive into the comedic groove every Friday at 8 PM! Experience the funky vibes of Toronto's top comedians at Backroom Comedy Club. Join us for a night of uproarious laughter, good times, and the perfect start to your weekend. Secure your spot for an unforgettable evening filled with funky fun and stand-up brilliance!

🚨👉 To RSVP for this event, head to our [Luma event page](https://luma.com/cye39lls). RSVPs are intentionally closed on Meetup.👈🚨 https://luma.com/cye39lls Join us for a welcoming and inclusive coffee meetup where women and non-binary folks in tech can connect, share experiences, and build community in a relaxed setting. **April Topic:** When the Ground Shifts - Navigating Change in Work and Life Whether you're an industry veteran or just getting started, everyone is welcome! **FREE ENTRY** – However, please support the café by purchasing a drink or snack while attending. **Location:** Prema Coffee and Bar, 35 McCaul St #110, Toronto, ON M5T 1V7 **Time:** 11:00 AM – 1:00 PM **Schedule:** 11:00 AM – 11:30 AM → Arrive, grab a drink/snack, socialize 11:30 AM – 1:00 PM → Group discussion, paired chats & activities **Important Notes for RSVPs** We’re introducing a few questions when you RSVP to help us manage space and ensure an inclusive environment: **This is a space created to support people who are underrepresented in tech.** We ask **cisgender men** (men who were assigned male at birth and identify as male) to respect this and not attend. **To manage limited space, we track no-shows for all Code Diversity events.** If you RSVP and miss two events, you’ll be waitlisted for future events. Please update your RSVP at least 24 hours in advance if you can’t attend. **Photography & Video Disclaimer:** By attending this event, you acknowledge and agree that photographs and/or video recordings may be taken. These may be used for promotional purposes, including social media, websites, and other marketing materials. If you do not wish to be photographed or recorded, please inform the event organizer upon arrival. **Organized by TechTank** Let’s continue fostering diversity, inclusion, and innovation in tech—this month and beyond! **Join our vibrant community for the latest updates and continued discussions:** [https://linktr.ee/techtankto](https://linktr.ee/techtankto)

[Summary] This meetup is for those who are interested in code, web development, design, cloud, or AI. All levels are welcome, so feel free to bring your laptop and discuss what you are working on or what you are learning. You can share your projects and ideas with other participants freely. There are outlets and WiFi, drinks are about $5 for tea, they take card only. [Price] Attendance is FREE. But you need to buy something from the venue. [Policies] \- We do not tolerate harassment of our members \- We remind users that that this meetup is intended for networking and hobby development\, and any attempts at using this meetup event as a dating platform will not be not be tolerated Further information: https://torontostack.exchange/

**NOTE the location we are meeting is at** **Fairview mall food court - We will be seated near PICO pizza** Join us for a relaxed evening where traders of all levels come together to meet new people, share market ideas, and talk about the week’s trends and themes. Whether you’re curious about the overall market condition, looking for fresh setups, or just starting out with trading, this meetup is the perfect place to ask questions, learn from others, and build your network. We’ll open the floor for casual discussions on current market conditions, sector rotation, trade setups, and risk‑management practices, while also giving newcomers a simple, jargon‑light way to understand how to get started in trading. Bring your charts, your ideas, and your questions—no sales pitches, no gurus, just honest conversation among people who love trading and learning from each other. **Telegram group for quicker communication:** [https://t.me/+m8BMRABGX74xNmZh](https://t.me/+m8BMRABGX74xNmZh) **Discord Group for exchanging ideas, charts and strategies** (Link is in the Telegram group pinned post) NOTE: Not financial advice. This event is for educational and informational purposes only.

Hello everyone, I'd like to invite you out to a fun-filled afternoon with this fantastic party social game called **MUSIC BINGO** Everyone can play (It's easy to learn and most of all it's a lot of fun) \*Joined by my other groups too so we can anticipate a fabulous day :) **Where to Meet us?** **Date: Sunday April 12th** **Arrive between 4:00 pm - 4:30 pm** **Location:** La Carnita - Good Fortune Bar (Main Floor) **Address:** 130 Eglinton Ave. Toronto, ON M4P 2X9 Event Details Below: Sincerely, Steve Flemming (Music Bingo Host) \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Details of Event:** **\*MUSIC BINGO\*** **(An Afternoon of Fun, Treats and Great Music!)** -Lots of laughs and thrills in store as we enjoy a terrific afternoon making new friends, singing along (optional) and playing **MUSIC BINGO;** hosted in a super fun designed format :) \*Treats handed out to the winning participants during each round we play \*Invite your friends or come on your own! **Event Fee:** 10 dollars at the door (cash only please) Includes: **Music Bingo,** treats, reserved room/seating, lots of laughs and plenty of fun people to play the game with) \*or e-transfer in advance to **steveflemming11@gmail.com** \-\-\-\-\-\- **Friendly Reminders:** -Please arrive between 4:00 pm and 4:30 pm \*Music Bingo will start shortly after that (Invite your friends out too if you like) **Parking Available:** \*Plenty of free street parking on Eglinton and (Residential area south/east of venue for free) **Close to Subway Station:** \*Also right beside the Yonge/Eglinton subway station

The global Azure community is coming together again, and Columbus is officially on the map. View the session lineup and speakers at [Global Azure Columbus 2026](https://coazure.github.io/cbus-global-azure-2026/) On **Saturday, April 18, 2026**, the Azure Columbus Meetup, DevOps Meetup, and Code and Coffee Meetup are hosting our local edition of Global Azure 2026. This is a free, community-driven event packed with learning, networking, and all things Microsoft Azure. Whether you’re building modern cloud-native apps, experimenting with AI agents, deploying containers, automating infrastructure, or just beginning your Azure journey, this event is for you! **What to Expect** * Engaging technical sessions * Real-world Azure architecture & cloud-native patterns * AI, agents, automation, and modern DevOps * Food and drinks (because learning burns calories) * Time to connect with fellow engineers, architects, and cloud enthusiasts **Who Should Attend?** * Software engineers (any language, any stack) * Cloud architects * DevOps engineers * Data professionals * AI explorers * Platform builders * Anyone who loves solving hard problems with great tools If you build, deploy, automate, scale, monitor, or optimize in Azure, you’ll feel right at home. **Why Global Azure?** Global Azure is a worldwide community event where Azure user groups host learning sessions on the same day across the globe. It’s grassroots. It’s technical. It’s practical. And it’s powered by people who genuinely love sharing what they’ve learned. And yes, it’s free to attend!

AI is changing how art is made. But when does it stop being your work and start being the machine’s? This month we're going to be doing a panel with with digital image, music, and written word artists, talking about at what point, while using AI in the creation process, does the work become not the artist creation? We encourage audience participation during this event that will be moderated by Chris Slee. Whether you’re deep in the field or just getting curious, come connect with others building and exploring AI in Columbus. Sponsored by [Transform Labs](https://www.transformlabs.com/services) Sign up also accessible via [Transform Labs Luma](https://luma.com/55umjqta)

Want to be a speaker? submit your talk to our Call for Presenters!!! https://sessionize.com/cbus-hug-2026/

The Fellowship of the Star Schema: Transforming OLTP Data for Power BI One does not simply build reports on OLTP data. Join us on an epic journey from the depths of raw, normalized tables to the shining halls of a well-modeled star schema fit for Power BI greatness. We will demystify the differences between OLTP and OLAP, walk through star schema vs snowflake (and why Power BI has a clear favorite), and show you the compression differences between normalized and columnar storage that will make you never look at an OLTP model the same way again. We will cover the different types of dimensions, when to use them, and how to handle Slowly Changing Dimensions without losing your mind. You will leave knowing exactly how to identify a bad model, how to convert OLTP data into a clean star schema, and how to forge relationships that rule them all. Whether you are a data wizard, a curious hobbit, or somewhere in between, your models will never be the same.

Please see below for details of our April 15 event. Visit our [Eventbrite](https://www.eventbrite.ca/e/owasp-toronto-april-2026-tickets-1986283430209) page to RSVP! APIs power virtually every web and mobile application, accounting for over 80% of all Internet traffic. And APIs are under attack. Gartner states APIs have become the “most frequent attack vector," resulting in hundreds of highly successful, high profile breaches. This API security presentation covers 1) why attackers love APIs, 2) real-world breaches (and how they map to the OWASP API Security Top 10), and 3) best practices to keep APIs secure.

**Important time note:** Please plan on arriving between 5:30 and 6:00 as the elevators lock after 6 and you'll need to message us and we'll need to come get you. The building address is 4450 Bridge Park The entrance is 6620 Mooney St, Suite 400 You will need to scan your ID at the door to get a visitor badge. **Abstract** GitHub Copilot is powerful, but what if you could scale from a solo AI assistant to an entire team of specialized agents working in parallel? This session introduces Squad: an open-source framework for multi-agent orchestration that lets you define teams of AI agents with specific roles, responsibilities, and expertise. We'll progress from Copilot basics to the Copilot CLI, explore how Agents add autonomy, and see how Instructions and Skills let you customize agent behavior. Then, the climax: a live demo where a Squad team of 3 agents (Lead, Developer, Tester) stands up and builds a working application in real-time, showcasing true multi-agent collaboration. Whether you're new to AI or exploring how to scale your use of Copilot, this session will show you what's possible when agents work as a team. **YouTube Link** TBD

Columbus Code & Coffee is an inclusive, informal co-working session. People of all skill levels attend, and we love it that way. Many people (optionally) bring projects to work on, and many other people (optionally) socialize the entire time. It's entirely up to you! **What to Expect at the Intro Circle** \~\~\~\~\~\~\~\~\~\~\~\~\~ Near the beginning of the event (1:30 pm), we do a standup: * Organizer announcements, updates, and logistics Round 1 - (7 secs max): * Your name * What you're working on * What you can help others with Round 2: * Community events you wanna plug. If none, that's cool too. Round 3: * Job opportunities you're hiring for OR announce that you are looking for one. If none, that's cool. After the introduction circle, everything is self-organized! Feel free to work alone, pair up, attend one of our workshops/presentations, or mingle!