Hi Jillian,
I may be up for going in together with a few people for upcoming festivals?
Ive done a few in the past. Some I would do again, some not.

One thing Ive discovered for myself, if working in the middle of a music event the quality or type of sounds blasting around where massaging can be either very harmonious or discordant to a nurturing, deep or even lightly relaxing session.
Alot of times even if we may not particularly like a particular type of music / sound it can be muted into the background noise in a way when working with people. And appreciated for its own unique flavor.

One of the last trance events I worked at, which had pretty decent music the year before, that time the music being played for most of the event felt very jarring and discordant to me. Kind of like an audio version of someone having & expressing a really unpleasant, hostile & chaotic trip. From comments I overheard from random people during the event it seemed to be a fairly shared feeling among some attendees.
I tried one or two brief massages but the sound was so loud and discordantly jarring that it felt like swimming upstream against a chaotic turbulence, and i ended up not feeling like doing bodywork during it.

The reason i bring that up is that it may be helpful to simply consider that when planning to participate in various events?
What kind of environment will be near a massage area? Neutral to pleasant smells? Next to an incense stand, flower stand, no particular smells or near rows of porta-potties? Sounds? Types of booths? Curfews for offering bodywork? Is it allowed or overlooked at least to camp / sleep in the space rented for doing massage, when not using it for massage? Etc.

There are quite a few events from about now through Fall in northern, and probably southern ( probably most places ) California.
I have been feeling more interested in doing massage at events again this summer. Looking into them. Can be expensive with booth fees, tent or booth materials depending on chosen set up, etc.. Which makes sharing with a few others appealing if everyone enjoyably agrees first on specifics of arrangements.