"We got married" party after the wedding etiquette

You can register if you want! I don't think people would see it out of the ordinary. I would the same rule for sending those invites as you would a normal wedding- 6 to 8 weeks before the event.

I personally would not create a registry for it. You can send the invitations out the same time just make sure to explain its a celebration of your new marriage not an invitation to a wedding so people aren't confused.

My cousin did this a few years back. Her "reception" was a month later, and they did register. They did put on the invite that they were getting married abroad, and that they were hosting this reception for their friends and family. She wore her wedding dress, and everything ran like any other reception. The only difference was that there was no ceremony to sit through.

I wouldn't register. "Hey, give us gifts, even though you're not invited to the ceremony." Nope. I would send invitations out after your wedding, announcing your marriage and inviting people to come celebrate with you. If they bring gifts, great, but don't suggest they do by registering. I also would stay away from the trappings of a wedding - the dress, cake, dances, etc. If you do all that, might as well just have a wedding at home where you can invite these people in the first place.

We are having a destination wedding as well, but we are inviting 110 people to the wedding and reception. My guess is that approx 40 people will attend the wedding, and that 80 people will attend the reception. Right now we are thinking of sending an additional RSVP card for our hometown reception, in with the invitations. We don't want to register (FH didn't want to register regardless of a destination wedding or home wedding), but FMIL is insisting because we have family across the country who will be invited, and will probably not attend (as it stands right now we have flights from Vancouver, Calgary and Toronto for our wedding). We will do a small one at the Bay and maybe Bed Bath and Beyond or something small, but we really understand that destination weddings cost a lot and we honest to goodness dont want anything except peoples time!

Are you inviting the same people to your DW, and just having the at-home reception for the benefit of those you know can't make it? Or are you inviting additional people to your at-home reception? If its the first option, I don't see any issue with registering but if its the second option, I don't think you should register for the reasons @JP+AP said.