I read the advice to mark all your invitations with a number on the back, and then keep a corresponding list. That way, in case someone forgets to write their name on their RSVP, you can refer to the list to see who it belonged to. It may sound like a waste of time, but it's a really great idea. Believe me: someone will forget their name!

So, here's my secret: get yourself a UV pen. Because if you're like me, the idea of a list is great but, you don't want an ugly number making up all your beautiful invitations. The moment I saw a sonic screwdriver that is both a standard pen and a UV pen, the light bulb went off.

And it worked perfectly! Not only that, pretty soon every time an RSVP came back in I was running to get the sonic screwdriver so I could find the number and check them off my list.