I'll speak for ADPi we didn't do informal, per say, we just extended ~5 bids to replace the girls who dropped! I'm proud to say we'll be at capacity next year!
Congratulations! What fantastic news.
__________________ "If you want to criticize my methods, fine. But you can keep your snide remarks to yourself. And while you're at it, don't criticize my methods." Rupert Giles, BtVS
As far as I know, there are several chapters at IU doing informal this year - and they're not the ones you would expect at ALL. Talk to your Rho Gamma, she can help you get into all the informal stuff.
And I do know the chapter totals for some houses at Indiana...Tri-Delt got 32, Gamma Phi had 61, Theta and Zeta have 39.