I've shot lots of protests while working for the papers. Don't bring much gear so you can get around easier. Maybe just a 24-70. Once you've done a few you get the hang of how they work.
You see the same photos all the time.
Team A with the signs
Team B yelling at team A
Young child with sign protesting something they know nothing about.
Older person wanting to get into the media, with a sign
Person from team A, or was it team B, with a flag over their shoulder like they just won the Olympic 100m.
Police on horses keeping the crowds apart
Guy cleaning up the garbage once it's all over, or shovelling horse shit into a wheel barrow.
Have fun and watch where you step.