Are there parties in winter?

So like how do I become aware of when parties are? What days of the week are they on?

I'm a freshman, I excel at academics just fine so am unworried about those. I kinda am terrible at socializing though. Like I have crippling social anxiety.

Like I'm just looking for friends, and I've heard frat parties are easy to get in as a girl? Would I be able to get in as just a singular person or would I need to bring friends that I don't have?

Would I need to be part of a sorority to do so? What's the entrance fee like? I've heard about girl to guy ratios and am unsure how that works if I go alone

I'm sure this stuff gets asked all the time I'm just an overthinker