You are not the only one to be hit by ridiculously loud sound levels at live performances, wich BTW have nothing to do with "professionalism" or any sort of "artistic value" from the performers or the sound provider.

Good idea to allways carry with you those ear plugs.

You may also conduct a "search" at this site- the best in the live audio industry.

http://www.live-audio.com/

D.