The most popular groups are international student groups, politically oriented groups, and community service groups. Club sports teams, especially ultimate frisbee, soccer, and hockey are very popular and many of the varsity teams, specifically soccer, hockey, basketball, lacrosse, crew, and sailing are popular. There is no football team at Conn College.
I am involved with Intervarsity Christian Fellowship, which is a group on campus where Christians of all denominations and interested non-Christians can get together and learn about Christ through studying the bible, support each other through small group meetings, grow in relationship with God through prayer, worship through music, and help others through community service. It's a great way to get to know other Christians and to grow in faith in a college environment that doesn't always see religious faith in a positive light.
Many students do leave their doors open in dorms, but it would be nice to have more people doing it.
Athletic events are of limited popularity, but hockey, basketball, soccer, and lacrosse games usually draw pretty good-sized crowds. Theater and dance events draw big crowds, and these events are usually quite enjoyable.
The dating scene at Conn is unique to my experience. People get involved in relationships, but there are few places to go on "dates" especially if you don't have a car. Also, a lot of students aren't really that interested in getting into serious relationships, but are more interested in experiencing college life and all its liberties to the fullest.
I met my closest friends while playing frisbee out on the main green freshman year. I've also met other close friends through the clubs I am involved in at school.
Being awake on Tuesday at 2AM means you are either doing homework (studying for a big test or finishing a paper) or out with friends (usually a night out for seniors).
Traditions/events that happen each year are Camelympics (series of athletic competitions between dorms), Halloween Dance, Black and White Formal (Dance), Fall Concert (a relatively big name in music performs), Festivus (pre-Christmas celebration with a politically correct name), Winter Formal (Dance), Spring Formal Tent Dance, and Floralia (huge outdoor, day-long, multiple-concert, drinking party).
People usually party every thursday and saturday night. Seniors sometimes add tuesday night to the list.
There are no fraternities or sororities, which I think makes the college more unified and socially interactive.
Last weekend, I went to a dance put on by our college after hanging out with friends for a few hours prior.
You can drive to another city and try to find nightlife there, hang out with non-drinkers on campus (they do exist on campus, but are hard to find), do homework, go to bed, or try going to parties sober (not recommended) if you don't want to drink Saturday night.
Off campus, I go to the beach, go to restaurants, go shopping, go to a nearby major city (boston, NY, or providence) for a concert or to just see the city.