Space travel isn't so common where I come from, unless you know the Doctor. I'm from Earth originally, at about this time in history so not too common.
Oh, I'm not too strict on dress code. Something nice. I mean, the bridal party will be all fancy, but we have to be. If you want to tell him he has to wear a tux, I won't tell him differently (though I doubt very few others will be that dressy).