I was happy up until the lack of understanding in the last posts.
With a tribute band the ENTIRE point is to sound as close to the original as you can. Are you really suggesting that you can remove the dynamics from songs and they still sound as they should?
That would be a new version of the song. Could you ask an orchestra to play Ravel's Bolero without dynamics? Let me make it clear - we have the ability to play the entire set list with an acoustic bass, a cahon, and an acoustic 6 string. Of course we could play at minuscule volume levels, and we could happily sing without microphones - but that isn't the point.
We can play God only knows at a volume level a vicar could whisper over - but it would NOT sound like the beach boys would it?
The organisers have come up with a scheme that might help - we can easily drop the bass and the kick drum level without any major consequences, and they're asking if they can build a wall 25 feet in front of the low stage 20 feet tall out of hay bales - the farmer next door has offered them. We could then raise up the tops, so they fire downwards at an angle, and we won't use the subs at all. The hay bales might be an effective barrier to the HF end carrying. By how much, I don't know. I'm taking our PA there this morning with a CD to play, so we can see the kind of volume levels we need to go to.
In our business, with Facebook and other social media, you are only as good as the last gig. This one is corporate, so perhaps won't matter quite so much as the people present have not paid - but it sticks in the throat to not be able to be authentic - even though the reason is solid.
Downunderwonder - we do indeed stretch the dynamics with faders - and the only sound op we use is the old bass player in the band - because he knows the songs, not because he knows much about sound systems - but he can craft the songs. Our songs are studio crafted songs - loads of tweaks and effects, and far more than the four voices we have - so we're talking double tracking type effects, odd reverbs for phrases, and BIG fader pushes on one held vocal chord type effects. Strip all this out and it becomes karaoke!