stereotypes/spring teas

I'm from OOS(North) and am hoping to rush next year. What sororities are known to be most focused on academics and philanthropy vs partying? I have a high enough GPA(3.9 UW/4.35 W) that I don't think I'll be limited that way. I have served as an officer in 3 different clubs and have tons of community service, but I'm not a legacy anywhere. What sororities do you think I would have a chance at/would enjoy?

Also, I've heard about spring teas. What/when are these? How do you get invited to them? I filled out the interest form but it only had name, adress, email, etc on it, so I wasn't sure how they could incite girls from that.