I've found that this varies quite a bit. In some bands the MD will go down the pub with the band and attend the social events. Elsewhere the MD only mingles with the band during rehearsal/contests/concerts i.e. a professional/musical relationship only. Also, it seems many bands go for a resident conductor then get someone else in for a week or two for the big contests. Sometimes the resident conductor doesn't get to do any concerts either. Other bands have one guy conducting it at every occasion. Others get a different MD for each contest, which can sometimes be due to availability. There are pros and cons to each approach. What are your preferences?