yeah, jeff still handles trivia (let me reiterate, bitb). not sure if things have changed (played weekly from 05-07 or so) but there wasn't ever a hard limit - available seating usually limits it (over 6 and you're being a dick imo).
it got to be when i was a student that you'd often have to be there by 7 or so - for a while it got so bad you had to preregister your team during the day (like by lunch time or so).