Rushing as a Sophomore at an SEC school
 

Thanks for your help!

Yes, e-mail the rush chairs and remind them.

Nobody can tell you your chances of getting a bid. Obviously, getting invited to rush parties is a good sign, as it means they know you are a sophomore and still want to get to know you. You could send an e-mail now like "Thanks for the invite to XXX event. Unfortunately, I will be in Outer Mongolia all summer, but I can't wait to be in touch when I get back". Then, follow up again when you get back.