The ISSA meetings are not official CU-Free meet-ups, and you might not see any CU-Free members there. They are the student secular organization that we have some occasional contact with. They have meetings every Thursday. If you'd like to find out more about the student group, check out their website here: http://www.illinissa.com/2011/04/godless-youths-invite-public-to-ask_03.html.
They have a meeting in campus, and then they usually head to Murphy's Pub on Green Street afterwards.
There will be no CU-Free person hosting, and there's no need to RSVP for this. Just contact the student group.
If you are looking for the regular CU-Free meetings, just look for anything without ISSA in its title on the calendar.