You will most likely not see goofy shenanigans during rush. That is when the fraternities and sororities try to attract new members. Fraternities and sororities need new members to keep the house alive and continue the legacy. Kinda hard to attract new members when you’re publicly humiliating them.
Now initiation is another story…
For those who never were part of the greek scene at college, there are 4 stages of membership:
Prospect - During rush, the organization is evaluating the student as much as the student is evaluating them. Everyone has to live together for 4 years. It’s better for everyone to make sure there is a good fit.
Pledge - Toward the end of rush, the fraternity or sorority may invite the prospect to join them. If the prospect accepts, they become a pledge. This is where most of the hazing will occur.* Especially during initiation.
Active - After initiation, the student is a full and active member of the house with all rights and responsibilities, both stated and implied.
Alumni - These are the assholes that graduated only come back for parties and insist that “Don’t Stop Believing” be played on the house stereo system at an obscene volume because “This was the shit back in '84” or whatever.
It is totally possible that fraternity/sorority members arrive back at school before the term starts to get the house cleaned up and/or initiation of pledges. At my fraternity, we were all expected back a week early each semester to give the house a thorough cleaning before classes began. But that was all we did, from 7 am to 10 pm, was clean.
Actually, we did the cleaning two weeks before classes began for the fall semester because rush week was the week before classes began. We did our initiation one of the first couple weekends of the spring semester. It was like a weekend long party from Friday night to Sunday morning. My cousin’s fraternity at a state school did a week long initiation that was all hazing.
Now I’m an alumni and I go back for parties and play “Don’t Stop Believing” on the house stereo because I’m an asshole.
*Not all fraternities and sororities haze. Everyone at my school (a private engineering school) that went to high school in the U.S. graduated in the top third of their class. Everyone there was a geek and/or nerd. None of us would have tolerated hazing. In fact, one fraternity tried it once and the entire pledge class quit. My cousin joined a fraternity at a state school. I sat there in abject horror as he told me of the hazing rituals they went through every year.