Are We Really Invited?

So, today I received an invitation for our family to go to a party.

When I opened it, this is what I found...

The question here is, are we really invited or is this just a cruel trick?

p.s. I know we are really invited, there are probably so many invitations going out that this one got put in the envelope without all (or any - for that matter) of the details. I just laughed when I opened it, because I am afraid that this is something I would do sometime.