Suppose its up to promotors to do there homework and book the dj`s that they think is right for there venue, also knowing there crowd and knowing what they want, in my experience most of the people who want to hear different music are the sit down and listen type anyway, and at local venues giving everybody what they want has allways been the best way for me, nowadays at local soul nights there is a warming up period anyway before they venture onto the dancefloor wich gives the dj`s to play something different, or maybe its dutch courage