Here are the details:
For questions during the event, type /msg DevBot yourquestionhere where "yourquestionhere" is your actual question. There will also be a separate channel just for chatting with other attendees.
I use Trillian for IRC, but mIRC is another good one. For The Gamers is also providing a web-based client for the chat. Full details on how to connect if you are having issues are provided here.
Maybe I'll see you there, preschooler permitting.