Sign the papers now, ceremony later?

We live in Colorado where we can self solemnize the marriage and don't even need an officiant to make it legal, just to clarify that part!

I think it's fine as long as people know that you have already legally wed. When you keep things like that a secret, you are lying to your guests, which doesn't go over well. Especially due to COVID, most people are understanding of getting legally married and holding off on the celebration until later.

It’s fine as long as you’re not hiding it.

That’s fine ! I’ve seen people do that even pre pandemic

View Quoted Comment Yes! I love this. My hometown, Washington, DC offers this option with self solem. as well.

When you sign legal paperwork, that IS your ceremony and wedding. Anything following is a renewal of vows. If guests are invited to anything, ceremony and reception must be held same day with all guests invited to both.
Guests will understand if you elope privately with just announcements and no party. Why not make everything legal while your guests are in attendance? They not judge you if you are honest about 1) eloping with announcements and no party or 2) a renewal of vows as long as you do not call it THE wedding to discount/negate the private legal wedding as though that first one is not real or valid in any way.