My FI and I have been discussing moving our wedding date from Sept 2012 to Sept 2011. If we were to move up the wedding a year, the only date we could do would be the labour day weekend.
Would you have a problem if you were invited to a wedding on this weekend? Another issue is that his immediate family always has a camping trip that weekend. I am sure that they wouldn't have an issue moving it to the August long weekend but it is something I would have to discuss with them.
I am going to two different weddings this Labor Day weekend. I don't see anything wrong with it. But if your family already has an annual event scheduled for that weekend, you might check with them before you plan your wedding for then.