Just stop at a drug store on the way to the show and pick up a back of foam earplugs. You can get about 30 of them for a couple dollars. You could bring a SPL meter and measure the sound if you're curious to get a decibel number, but, safe to assume, that much power almost anywhere is going to be really loud. Anything above 95 DB will do cumulative damage that will never go away. The ringing might stop the next day, but every time that happens, less of your hearing will return. If you want to continue to enjoy music 30 years from now, get some plugs today.