Keeping in touch with bankers over senior year/winter break

Hey all,

I'm a senior student at a target school; over the last summer, I worked at a BB in their Investment Banking Division, and I have since accepted an offer to join full-time after I graduate this spring.

While I got fairly close with some of the FT bankers in my group while I was there over the summer, while I'm at school I can't think of much reason to catch up with them until my start date gets closer. I was wondering, what are some best practices/typical expectations in terms of keeping in touch with the bankers in my group, both junior and senior, until I get closer to my start date? With the younger bankers especially I know it would be good to maintain connections with them as many will be going the HF/PE route or simply leaving the firm before I return, but don't want to seem like I'm reaching out just to ask them what their next moves are without much development in my own life other than clutching to my last few months of college and socially condoned degeneracy.

So, what do you guys think? Is it usually okay to catch back up on connections made over your SA stint as you get closer to the summer and your FT start date? Or do most people try to keep in fairly constant contact over their senior year, and if so, what's the best way to do so?