There are 2 types of promoters / function organizers ..Good and Bad.

Good promoters :

Know how to keep the bands on their side by being fair and honest in the business dealings .
Provide bottled water for bands.
Provide a band room for changing outfits and chilling out.
Provide precompiled CDs of music to dance to between band sets.
Ensure easy access to lugg equipment in and out.
Allow plenty of time for bands to setup before the show starts.
Provide a table for the band and band guests (who are usually partners and/or involved in helping the band).
Allow room to the side; in front of stage for a sound engineer.


Bad promoters :

Really get up the noses of bands by crying too poor to pay the requested fee (then make a profit of up to $3000 for the night).
Cry poor over providing $20 worth of bottled water for the band (Then make a profit of up to $3000 for the night).
Refuse to provide a table for the band guests or refuse the guests period.
Block the easy access points so that the equipment has to lugged further than necessary.
Claim that they are too busy to open the venue early enough to allow plenty of time for the band to setup before the doors open.
Refuse to allow a sound engineer to have a small space at the side of the venue.
Expect the band to be do the job of a DJ between band sets by asking that the band play track 5 then track 3 then track 9 of this cd and tracks whatever of that cd.
Expect the band to get changed in a broom closet or in the car park.

I've had dealings with both types and it's not hard to guess which ones I will go out of my way for and which ones I'll avoid in the future.