You've had a long week. You deserve a nice relaxing hackathon at the Stripe office this weekend. Hack on a project, meet other coders, hang out, or just work on eating the food.
This hackathon will be very informal. Stripe provides the space and the food, and there will be plenty of Stripe engineers around for the day. You provide the project, or start one with other coders who are attending. Your goal for the day should be to walk away having built something cool. Past hackathon projects have ranged from building a simple PHP website to adding a new feature to Git to assembling a 3-D printer.