If this is your first time camping to TRF, keep in mind that the camping entrance is different from the festival entrance. You can just search for "The Fields of New Market Campground" (Google Maps: link, Apple Maps: link) in your map app to find the entrance. It's on County Rd 302 (Finke Rd), a very short drive from FM 1774.
Here you'll find a map giving directions on how to get to our campsite from the front (black) and how to the get to the festival (red). As cellular data is sketchy at times out there, it's best to download the map to your phone so you can reference.
The same goes for the Texas Renaissance Festival map - and the schedule.