how do the rho chi groups work?

Very curious about this as well. Seems almost cruel to make some girls wait outside if thats what they do. Especially if those girls wanted a house that they were dropped from.

Also, about how many pnms are in each group?

You will be assigned to a group number. Each group number has about 100 girls. Within each number group, there are about groups of twenty assigned to a Rho Chi, so there are about five Rho Chi's in each numbered group. All of these groups are done out alphabetically by last name btw. So each numbered group has a tent set up, and every morning you and the other 100 girls in your group will meet there. You will find your designated Rho Chi and get your name tag and your schedule for the day. Obviously the first two days are IWTs, and every has a full schedule. IWTs are the only days where you are with this specific group only when going into the houses. After IWTs, the groups that enter houses together during rounds have girls from all different original groups mixed together. And you only attend the parties you are asked back to, so no, if a girl is dropped she does not wait lineup and wait outside of the house, she simply just does not attend that party. During any breaks (times where you do not have a party but there are parties occurring) you wait at your original tent with the five Rho Chis and whatever other girls in your original number group that also have breaks.

I want to also mention that a lot of people meet their good friends in their Rho Chi groups. It's a great way to get to know girls and it's so cool to have friends in so many different houses. I met one of my best friends in our Rho Chi group and she's in a completely different house and we're actually living together this upcoming year. So utilize your Rho Chi's and the other PNMs! Strangers are just friends you haven't met yet!

Crossing my fingers those tents have fans!!! Lol!