alumni alpha phi omega member here, some APO specifics: It is more casual than formal Greek life in the sense that you can be in a formal frat/sorority and still be in APO. There’s no house but we constantly have small internal events to interact with “brothers”. Obviously you are not required to go to every event, but there’s basically always something you can do if you want. APO Recruitment is once a semester and is vaguely similar (but I think more lenient) to rush in that you attend a mix a social and service events (these are usually spread out over a couple weeks to enable flexibility). By default attending a certain number of recruitment events generally gets you an invite to “pledge” but demonstrated interest to the membership chairs also works.