RT I'm late to this thread but to me this sounds like a very elaborate fantasy (à la trapped on a desert island with someone). I can relate, I have often wondered what it would be like to be seated next to my T on a plane for example. And while both of our scenarios are within the realm of possibility, both are very unlikely.

I think the actual question about boundaries is less important than the question of what this scenario means to you and why you're dwelling on it. You started a very similar thread a few months ago and outlined a very similar scenario about seeing your T at a concert or festival. What's this about? What would you like to get from attending a concert with your T? If you let your imagination run wild and the boundaries could be entirely up to you, what would happen in your Burning Man scenario? Do you wish you had a girlfriend with whom you could drive to an intimate gathering? Do you need "permission" from us here on PC to have this fantasy and to assure you that it's entirely realistic and okay to socialize with T at a music festival?

Because you're allowed to have the fantasy. You're allowed to have any fantasy. Some of them might be possible and appropriate to act on and some not but you are still allowed to dream. Your dreams don't have to involve realistic scenarios or appropriate boundaries. And you don't need anyone's approval to have them.