Professional bands will have experience playing at venues fitted with sound limiters and will know how to accommodate them. The main solution will be to simply turn the PA system down to an acceptable level. The main problem arises from acoustic instruments like brass and drums, whose intrinsic "loudness" means that the sound level cannot be regulated electronically. With regard to drum kits, the solution can be to use soft drum sticks or even an electronic drum kit. Check out some of FixTheMusic's recommendations for wedding bands that are experienced with sound limiters and suitable for venues with limiters in place.