You can go have a celebration, no problem, or do you have to make a reservation or something?

I think that in the cabins you have to reserve because some have their date reserved but outside the cabin you can do it as the others say, pick up the garbage

Of course, you can hold a celebration without asking permission, no more than that you have to pick up your garbage.

You can celebrate, there is no need to ask for permission, just comply with the usual rules, I imagine not leaving the area where you do the activity dirty. Enjoy the birthday 🎂

It is public and you do not need a reservation, the only thing I believe is that it is zero alcohol