A slightly different event - we're going to spend a day hacking Lucene and Lucene-based search engines (Solr, Elasticsearch....). You'll need to bring a laptop but there will be ample power points and web access, thanks to Mimecast who have kindly provided the venue.
We held a similar event two years ago (see http://www.flax.co.uk/blog/2016/10/21/tale-two-cities-two-lucene-hackdays/) and we're also running a further Hackday in Montreal the week after, just before the Activate conference https://www.meetup.com/Apache-Lucene-Solr-London-User-Group/events/253610289/
We don't yet have a plan for what we'll work on - ideas gratefully received though! If you know a JIRA issue that could do with some work or an entirely new feature we could create do let us know in the comments. We'll have several Lucene committers around to guide us and you'll need some Java experience to get fully involved. We'll go out for pizza or curry afterwards - thanks Elastic for offering to sponsor this!
** Please register with your full name. We also need your company name, email and phone number. **