We will be doing 'tickets' for all precompilers, mostly to judge interest and to help us with room assignments. One or two will have a fee because of the consumables used during the session (robot parts, etc.). These will have limits because of the set amount of hardware we will bring, and how many people we can accommodate. But those sessions are usually repeated.
The free session 'tickets' are non binding. Do what you want when you get here. Start in one session, and move to another half way through. Follow your butterfly.
The paid session tickets are for the gear.