Since it's a college setting, you really get into the whole "college is what you make it" vibe, which was definitely how I went about it. Now, if you're thinking of making a college setting that's large, this is easier to do because there's so many options for your characters to do personal growth.
You've got student government bodies, living in the dorm and doing dorm activities, hanging out with friends after class, going to the library after hours, maybe even touring the town they're going to college in. School wise, it can depend on what majors they're doing and who they are as people when it comes to studying. You can also think about if your characters have any scholarships that have meet-ups with the scholars.
Majors like Engineering and Computer Science do have a lot of study groups. I know for myself, I was in a lot of group chats and discords dedicated to different classes. People posted syllabus, notes, old HW -- you name it! And a lot of people bonded that way. It's not uncommon to find people dating or having friends from their classes and similar majors. In terms of deadlines, these are usually based around midterms and finals. If you've got a big project for a class, that's usually turned it around finals or around the 2nd mid term exam.
For my college, we worked in semesters (fall and spring). The first mid term exams were often around October/March, a 2nd one somewhere in November/April, and the finals during December/May before winter break/summer break. Engineering homework for me was weekly, so deadlines were often at Sunday (11:59pm). Mini Projects were closer to the midterms and finals dates, so you can go wild with that.
There's also the difference between commuting to college versus living on campus. I actually did both, and I'll say the experiences were different. For the first four years, I lived on campus. I lived in a suite with two doubles and four singles (double means you have a roommate, single means you live by yourself). I had a single and my friends for those years were my suitemates, people from my major, and some scholarship buddies.
After that, the last two years were spent commuting. I actually made more friends in my major because of that, kept in touch with my scholarship buddies, and made friends with people going the same route home.
I hope some of this helps!! If all else fails, it never hurts to ask people about their college experiences. What they enjoyed about it, what they did to develop relationships and what growth they saw in themselves. I'd definitely say I enjoyed college more than high school -- more ways to become a responsible adult, more chances to grow as a person on my own terms, and different ways to cultivate my education!