This might be a little stretch, but due to a conversation with a colleague
about "what makes a good program", i've given a bit of thought lately to
the question of integrating newcomers vis-a-vis the (common?) programming
model that suggests a caller should focus more on neighbor interaction
early on, with partner-heavy dances later in the evening. In the
theoretical stages right now, but here goes...
Some dance organizations/communities (applause!!) have been quite
successful in creating a culture where experienced dancers identify
themselves in some way and/or actively seek out newbies with whom to
partner, at least early in the evening. In such a situation, it strikes me
that choosing choreography which emphasizes neighbor interaction may
undercut these dancers' efforts; when experienced dancers have successfully
partnered with newbies, using the choreography to help them teach by
emphasizing partner interaction - in swings, california twirl, promenade
across, R&L through, hey, et cetera - might be a way for the caller to
amplify the efforts of a proactively integrative dance culture. (Perhaps
arcing from partner emphasis at the start, to neighbor emphasis as newbies
become more integrated, and back to partner towards the end?) As was said,
announcing a mixer well in advance would also ensure that proactive dancers
aren't being undercut by caller choices.
On the flip side, dance communities/cultures that tend to be cliquey are
often also less open to mixers. In this situation i would think emphasizing
neighbor interaction to be very important, and if a mixer was viable (eg
not too much a threat to the caller's social capital), i would tend to
"spring" it on the dancers so as to confound cliquey dancers' partnering
practices.
The bottom line emerging for me is that programming choices should work in
concert with what's happening on the floor - amplifying the efforts of
proactive dancers, confounding cliquishness when possible - and to some
extent rely on substantial knowledge or observation of the dancers'
partnering behaviors - but these are just half-formed thoughts...