So every time you purchase a ticket rush you're assigned to a different fraternity? This can either be the same as the rush period before or different? I.e if I was orange one day I could be blue the next?
Buy the sign up item, "Ticket to Rush", it'll put you on s team. Collect Pledges as drops from all parties, whichever team has the most drops gets a prize. Wait 24 hours, then repeat. If you collect 100 drops, you get the cool ring stat item. If you collect 5 of the gold rings, they combine into the bling ring.
During each Rush Period you may be assigned to a different Fratority depending on your luck when you purchase the Ticket to Rush item.