If you check your college's campus activity calendar, you'll likely see a multitude of different events, from comedy shows, to dance productions, to trivia nights, to karaoke or open mic. All of these require technical services like lighting and sound, and many colleges employ student-run organizations to provide these services. It's a great way to get to check out events for free, too.
The online application process for these jobs—or perhaps “gigs” is the better word, since they're all for independent contractors—is pretty simple and straightforward with very little required of candidates. Some of these opportunities—like the micro-jobs—you could very well apply and start the same day. And these jobs require very little commitment and can typically be done on your own schedule.