All of those liberal ideologues who think that they are doing the world a great favor when they make simchas with mixed seating should be mindful of the fact that any guest [male or female] whom they invite who has Yiras Shomayim and cares about Tzniyus is likely very uncomfortable.
They will attend in order not to offend, fake a smile and that they are enjoying themselves in order to be polite -- but it is a show.