I have less faith in humanity. There is a music festival that happens where I used to live and even the well managed and manicured Orange county when the festival let out the gas station was overwhelmed, the place smelled and a few people just said fuck it and walked out with shoplifted shit.
If I were you triple your no Trespassing signs (photocopies in sheet dividers should last the week or so), stock up on a few extra gas cans, fill your tanks now, make sure you carry fire extinguishers, shovels, etc in you vehicles and perform a regular fire patrol
and carry.
I'm sure most people will be nice and it be a bit of a boon to your local economy but how is the infrastructure set up to resupply gasoline, food, water, etc. Sure 99% of people will be cool but crime always goes up in relation to transient population, etc.
Your biggest problem other than chasing people off your land and cleaning the garbage up after everyone leaves will be some ass flicking a cigarette out a window like they would in a city and it catching the side of the road on fire. Even a small extinguisher and shovel can help stop something if you see it when it starts smoldering.