If you can, don't go alone.

Don't be identifiable, as others said.

Don't do anything illegal your first time, especially if you're alone, or anytime for that matter naturally, you know the thing.

Don't separate yourself from the crowd. Cops will sometimes target people outside the mass to present the image of a crackdown without targeting particular blocs because that's riskier.

Stay safe.

I just realized you didn't ask for advice. Sorry about that, but hope you enjoy and it goes well!