bid questions !!! HELP !!!!

[heaz]

Ok guys, I was just wondering if anyone had any answers to my many questions about informal rush!! Im going through this week and panellenic said that the sororities cant give any bids until Friday. Thursday I have 2 parties at houses ive already been to and then tonight a different house that i visited Mon. called and explained that they werent allowed to give the bids till Fri, but theyd hope to see me there then. Ok im really confused, ive never been through rush before and this is just becoming way complicated ?? What happens when you get bids during informal rush vs. formal??? Are there lists , etc.??? Any help in clarifying would be great !!!! There are only 4 houses rushing and there are probably 50 girls going through, if this helps !
thanks