Hm, okay, so the trouble is to find info on these things...
Right now is maybe too late to plan for today, next time try to plan ahead. So try to find something for the weekend or next week?
(It would help to know if you live in a city or smaller town or rural area, and what your interests are... And do you just want to find something for Friday/weekend afternoons or evenings, or mid-week too?)
Is there a tourist office in your city/town? Usually they give out info of what is happening each month..
Have you checked the websites of your college and campus (and dorm) and student radio or such? Some cities (or maybe colleges too?) even have magazines with events or a section in the magazines..
Is there a college info office or youth community center or something like that? These may have posters and brochures too.. Youth hostels can have some brochures, flyers and info too.. And libraries, book stores and health stores can have stuff pinned on the walls or flyers to take home..
There can be 'info points', or places with posters (maybe on your way to a restaurant/cafeteria or such?) There may even be posters or flyers in/outside the cafeteria or in some cafes.. There may even be events at the cafeteria (for example travel presentations, eg people show slides of their travels.. I really liked those too..) Sometimes you can sign up for mailing lists and get events mailed into your inbox..
Where I live, students also get info/brochures of main activities available at the beginning of the school year..
And there are places you can call and ask, or go there and get info..
Do you listen to the radio? Some things can be announced there.. Some universities/colleges also have own newspapers/magazines and radio stations..
Also, roommates/flatmates/dorm neighbours or classmates can tell of any interesting things happening, or you can maybe go together.. It can help if you find people who have some of your interests and they can tell you about things they go to and maybe give recommendations..
It's relatively easy to find something happening in a city/bigger town.. Small towns/villages/rural areas can be more tricky.. (You can go to the nearest bigger town though...)