I don't know where I saw it (excuse me, my computer crashed and lost all data), but the example I saw had a line for who to RSVP to, like this:
Date: ___________________________
Time: ___________________________
Place: ___________________________
RSVP: ___________________________
I like to have a greeting at the top, so I've been putting:
Please join our joyous occasion! (or other greeting)
Date: ____________Time: __________
Place: ___________________________
RSVP: ___________________________
I can see it might be handier for the customer and easier for me, if I left the lines off.
Please join our joyous occasion!
Date: Time:
Place:
RSVP: