InsomNicon is an event held every couple of years or so (with no set time or date) on the Metanet Forums. It involves the members staying up as long as they can to earn points, and includes challenges every couple of hours or so in order to gain more points. Prizes are awarded at the end, although since the forums are a non-profit organisation, no cash prizes are given (usually).
Throughout the night, conversations are usually held on IRC. The challenges can be posted on the forums, however, as this way you can use the thread for people's responses/answers to the challenge and converse about it on the IRC. During 2010, a record 42 people were on the forum at the same time.
In 2010, InsomNicon was hosted and run by SlappyMcGee, as will the 2011 InsomNicon.