Many Fedora projects and groups use three IRC channels on irc.freenode.net for their regular meetings: , and . That makes it easy for people that are not part of the groups that is meeting to get involved with them or at least keep track of what they are doing.
There are no general formal meeting rules -- but some of the groups have rules or guidelines like the FESCo meetings guidelines. Normally you are free to speak in meetings of all groups, but please stick to the topic and help make sure that the meeting is productive.
The time table for the different meeting channels ce be found in the Fedora calendar application:
Meetings Outside of this Channel
Sometimes groups meet out side of these channels, for example the Category:Board_meetings#Meeting_Schedule Board Meetings.