How do you keep a friend group together

weird q maybe, i struggle to make friends, especially have never really felt like part of a friend group (which ik isnt necessary but. sometimes i rly want one) recently tho ive been really enjoying spending time with a new group, but its kinda a situational friend group (we're all taking a class together),, end of the class is approaching and im wondering, any tips on trying to keep the friend group going beyond that? we all go out for food after class rn but how do i keep it together when we dont have that... we mostly live kinda far apart too