Wedding close to Halloween

I wouldn’t think anyone would show up to a wedding in a Halloween costume unless explicitly told to do so (and maybe not even then either).

If your wedding isn't on the 31st, I dont see why anyone would assume they can come in a costume. If you are worried, I would put a dress code on the invite and on your website (Cocktail attire, semi-formal, black-tie, whatever) That should absolutely be enough of a hint.

Include an FAQ on your website listing attire. Generally it is bad form to mention or dictate dress code in any way unless it is required by the venue for entry. Some venues require a certain look before you are allowed to enter, but they are rare. Word of mouth is probably the best route.

Even if the wedding was on 31 October, I wouldn't assume by any means to come in a costume unless expressly told (or written on the invitations) that it was a themed wedding and to come in fancy dress.

In any case, if you have concerns, include a dress code and communicate this to your guests - where I come from, whether the wedding is smart casual or black tie, we always stipulate a recommended dress code so that people know how to dress. This may be a good way to give you peace of mind on this issue.

View Quoted Comment I agree with this. It would never cross my mind do dress in a Halloween costume for any wedding, even on Halloween, unless I was expressly asked to do so. And even then I'd probably do something like Katherine Hepburn in Breakfast at Tiffany's so I could just wear a normal dress 😂.

Did you already send out invites? You can definitely put that in there like:
Attire
Formal /Semiformal/Cocktail/etc.

If you have a wedding website, definitely list the dress code as formal or cocktail attire on your website!

That’s my date next year too :-) that would be so weird if folks came in costumes. I wouldn’t think I’d have to tell adults with common sense not to come to a wedding dressed like a witch lol. Maybe in the invitations put “formal or cocktail attire”