There will be more social events, panels, festivals, and screening than you can shake a stick at-- especially in the first quarter. Go to as many as you can. Maybe you send up in a class that requires people to watching a movie on your own time (a likely possibility); invite the whole class over to your apartment. Throw birthday parties. Throw Halloween parties.
Los Angeles itself is a resource of good times. Hiking, beaches, Tar Pits, shopping, go-carts, mini-golfing, regular golfing, bowling, history museums, art museums (great for Tinder profile pics, apparently), out-door movie screenings, live theater, and more. Hell, if you just want to stay at home and draw dinosaurs on a Friday night, there are at least three other people in the program who also want to do that.
During the quarter, getting to class early means you have the chance to catch up with other early students. Between classes, check out the Writers' Lounge. After class, see who wants to get a coffee (also figure out if anybody lives in your neighborhood for carpooling purposes).
Remember: contacts are people that know you and like you; friends are people that REALLY know you and like you anyway.
We also want to shout to some programs, companies, and associations who help make our lives easier, including:
International Screenwriters' Association: http://www.networkisa.org/
Table Read My Screenplay: https://tablereadmyscreenplay.com/
Emerging Screenwriters: https://www.emergingscreenwriters.com/