Okay so my thought goes as following: Some birds are known for having a feeling of rythm and can be seen swinging along with music. Birds are somewhat related to dinosaurs. So if you could travel to the past with some nice music, there is a non 0 chance that you could dance with some dinosaurs (before being eaten).
The oxygen level was slightly higher back then, but nothing that would kill a human. But yeah airborne pathogens would be a problem, maybe wear a hazmat suit (with active personal climate control) to the dance party.
They HAVE those??? Shit…forget dinosaurs, with how global warming is going I need one just for waiting for the bus in the summer. I had no idea we could have air condition suits.
There are solutions like https://en.gazdetect.com/ventilated-chemical-suit/ and I read about some that are kind of build like a fridge (with cooling liquid pumped through tubes and a radiator). I was not able to find examples for those, but I blame the decline of search engines for that 😜