I made two different versions for my rehearsal dinner invitations. The ones for the bridal party also included the rehearsal time and place of the rehearsal along with dinner. Whereas, the ones that were mailed to just out of town guests (not part of bridal party and do not need to attend rehearsal) get a simpler piece.

Here is my wedding party rehearsal dinner invitations. We used our engagement photos to spruce it up! Actual size is 3 times bigger than the image below.

Here is the piece that goes to just out of town guests who are invited to the rehearsal dinner because they've traveled so far. For the simpler version, I ordered 10 from vistaprint.com which was a lot cheaper than the first one since I had photos on them. See simpler version for rehearsal dinner only below. I crossed off my husband's number so that's why you see that blob at the bottom.
All of the brides who I knew only made one rehearsal dinner piece so it's perfectly normal to just create one design only.