Ooo! I was VPE and planned a bid day- we did a luau, and it was so much fun- one of the best bid days, from what I've heard!

I have a great game for you to get everyone involved!
We took all our girls (about 70) into the parking lot of our house (but any big area would work) to play this.
*Now, I'm not a big fan of running, so we make sure it's pretty tame so no one gets hurt or anything. I'm sure it could be as rowdy or tame as you wanted!*
So, one girl starts and says something like "I drive a white car" or, have brown hair, or, am an only child, or whatever, as long as it's a true fact about yourself. Everyone that fits that category tries to run to that girl- whoever gets there first holds her hand and gives another statement about themselves, and it keeps going until everyone is linked together. Generic facts are good to use, because it's easier- also, if no one fits what someone says, then they try another fact. I had to give our girls a little friendly speech to keep it appropriate (you don't wanna freak out the new members!), but I guess that depends on the crowd.
When everyone is holding hands, whoever started the game gives a little speech about how everyone has stuff in common through Theta, blah blah blah... you know the deal. It's a really great game, just make sure the actives really get the new members involved! Maybe give a fact about yourself that you can relate to someone you talked to during recruitment!
I hope I explained it well- PM me if you have questions!