Watching a meet doesn't require anything except paying 5-10 bucks usually to get in. You can stay for as little or as long as you like. Most meets start around 9-9:30, everybody squats first, then benches, then deadlifts.
Meets are anywhere from 6 to 12 hours long depending on how many people are lifting and how well run it is. Single lift meets (just bench) are obviously shorter. Watching beforehand is a good idea to see what it is like, hope you enjoy it