1) Putting a first post together for the school (Most schools are up already! I will give the OP status to the threadmasters)
2) Keeping the thread updated with events/deadlines/etc - e.g. posting relevant material found, updates, interview debriefs found if not in the thread (from last year’s threads), and others.( Most of this information will be available on the school website and you will have them if you are applying.)
3) Keeping the thread organized - if something very helpful/valuable got posted, it would be helpful to put it into the very first post so that the first post serves as a valuable guide.
4) Keeping a roll call (this is automated) and keeping track of everyone who applied, submitted, interviewed, and keeping stats - it is quite fun.
5) Finally, being the GMAT Club advocate of your school!!