It's a simple bot, players just follow it, and GMs tweet out requests for players with certain hashtags. The bot just retweets all of those GM tweets so those following it can get them.
If tickets are required for something, it will be listed in the registration system.
Most companies or groups that get their "own" room are mainly running normal ticketed events inside and operate like anywhere else.
Some, like Rio Grande, are more free-form and don't have a set schedule, usually. Sometimes those are still listed in the registration system as a "no tickets are required" event, but not always.
Basically, if a schedule isn't in the system, then either it's still being processed or there is no schedule (and thus no tickets) and if you want more details on what will be in the room, you will need to contact the company directly to inquire.
Gen Con LLC
Is there a place where people game all day outside of the convention itself?
You can find people running games in some of the lobby areas of hotels downtown.
What's this in the just published catalog?
OPEN GAMING You’ve asked and Gen Con has delivered. Tables are available as a gamer oasis for you and your friends to play games. Available Thursday - Saturday 8 am - 2 am and Sunday 8 am - 3 pm. Game on!
There are some tables in the hallway to Lucas Oil that are set aside for gaming, so folks can squat there if they want to set up.
We will have plenty of tables in the main event hall for pick-up games to use as well, just check in with the Event HQ for availability, as usual.