Timing of announcement/ invites

We are eloping in November and having a casual backyard celebration about six months later on Memorial Day weekend.

I’m thinking we should send some sort of “got hitched” announcement that includes a save the date shortly after the elopement. Then sending invitations closer to the party date.

Is that a good idea?

Or just hold off and send the announcement/invitation as one in the new year?

The only travelers will be my fiancé’s adult kids (which is why we chose a holiday weekend). They already know and have the date blocked out. So not sure how necessary save the dates would be.

Help!