I am a native speaker, and I've heard "a riot" used to describe "a good time", but in isolation I'd definitely also picture the violent protest type of riot.
That said, this doesn't appear to to be a common usage in the US. Webster doesn't have this usage, Wiktionary describes it as obselete and pairs it more with excess than I would, (also they use fifteenth century examples), though Oxford has it.
I am a native speaker (UK) and concur. My grandmother would always threaten to "read us the riot act" if we were in real trouble https://en.wikipedia.org/wiki/Riot_Act
Conservatives invariably describe liberal demonstrations as "riots," in order to insinuate exactly the type of things you're describing. In response, liberals
1. View the term as something of a badge of honor
2. Have in fact grown more supportive of "vandalism" and "looting," using one's attitude towards them as a sort of litmus test of the value one places on the cause relative to property rights
If you want to sell to a left-aligned US business[^1], I think they'll view the term favorably.
[^1] For example, my wife is an aspiring design professional, and the consultancies in this space, including ones explicitly targeting conservative clients are overwhelmingly left-leaning.
