Our school has informal Fall rush. Basically, the College Panhel hosts a large info night in our gym. Then each individual organization decided when and if they want to hold events. We have a set date when bids can begin to be handed out, but other than that- each org is free to do anything else they want.
Small detail- you need 16 credits from our college or 12 transfer credits to go throught recruitment (basically, freshman can't rush...unless you were me and took a gazillion AP credits. didn't matter i didn't rush anyway)
Spring is formal. We're still debating how that will be handled this year.
