seems a bit ridiculous, even with the potential for angry locals etc... people are getting way too sensitive re: taking offence etc..
when it crosses the line on the grounds of say race i.e. black face then sure but in this case the objection is regarding purely political sensitivities which is frankly ridiculous as politics has always been fair target for mockery
also it is clearly the lefty/miners thing that is causing the butthurt, if they'd just dressed up to mock thatcher and tories without anything to do with the miners strike then I'd wager there wouldn't be any issue as universities are overwhelmingly run by lefties
I remember back when I was at uni there was some controversy over a vicars and tarts themed event party supposedly being "sexist" - it didn't get cancelled though, instead it was pointed out to the angry feminist/socialist worker types that both men and women can be vicars and that quite a few men were planning to dress as tarts too
frankly with stuff like this, if you don't like it then don't attend the event
edit - spelling