It’s simple. The earlier you sign up, the more you save.
Each event has a set of deadlines that (adjusting for holidays and weekends) roughly works out to be:
Only available for all events until December 31st!!
See individual event pages for current deadlines for each city. The first two events have Super Early Bird pricing available for a bit longer than shown overall above.
To adjust to venue needs, and to keep your pricing far below other events, venues are often announced about a month (3-4 weeks) prior to each event.