Admitted Students Days. Your school/uni may have these under a different name, but days where you can go to get to know more about the academic programs and campus activities.
New Student Send-Offs. Casual gatherings hosted by alumni of your school/uni who live in your region.
People From Your High School. Maybe you know people from your high school who got into the same college as you. Knowing some familiar faces can make adjusting to a new environment easier.
Class of 202_ Facebook Groups. Student-moderated Facebook groups for prospective students. Be sure to look for the one that is moderated by current students at your school/uni. There are some that are affiliated with businesses and posts a lot of advertisements. Once you join, make a brief post introducing yourself. You’ll get better responses if you’re specific about your interests (talk about your favorite TV shows/movies/books, your major, what you’re looking forward to doing in college, etc).
Contacting your Roommate(s). You’ll need to contact them anyway to make sure you guys know what you’re bringing for your dorm. Eventually, you can talk to them to get to know them better. Ask about their interest, but also ask about anything you should be aware of (e.g. allergies, sleeping/studying habits, etc).
Helping Others Move In. Maybe someone's struggling to move a heavy box or needs some tape to hang their photos on their wall.
Keeping Your Door Open the First Couple Days. Maybe one of your floormates will notice your cool collection of band posters and you two can bond over your similar music taste!
Orientations/Welcome Week. Meeting people through activities or department-specific informational sessions the first couple days after move-in.
Joining Clubs, Sports, Fraternities/Sororities. This one speaks for itself.
Creating/Joining Study Groups. On the first week of class, ask your classmates if they’d be interested in creating an online study group, a place where you can share notes, ask for help, or get information about the classes you’ve missed. You can make a GroupMe (recommended for smaller classes) or a Facebook Group (recommended for bigger classes) or any other social media you see fit.
Good luck next year! Remember that it’s okay to be nervous. There will be lots of people adjusting to a new environment just like you!