spring informal for guys?

How does fraternity informal recruitment in the spring work? Is their events? when should i contact them, that im interested? I'm really not sure what to do, i missed the formal recruitment deadline. So i didn't do formal.

Some fraternities that caught my interest have been PhiDelts, Theta Chi, PiKapps and SAE. Im a very chill guy, cares about my grades, but also likes to have fun and be social. what do you think would be the best fit from these chapters? It wont influence my decision, just curious.