It's another one of these disputes which is really between the unions and the government, so it's reasonably good natured at the sharp end (at least in some places), as the unions aren't actually cross with the councils and the councils aren't actually cross with the unions and they really don't want such national disputes to spoil good local working relationships.
So it is possible that in some cases some local "understandings" might be reached about particular functions or events or whatever (one could perhaps imagine "ok, if you want to run the mayor's tea party with outside caterers we'll make sure our picket lines are off on their lunch break as the pensioners come in") ... but keeping an entire airfield open against the strike is probably asking too much!