Surprise Birthday Party Invitations. The very first rule of planning a shock party is: Do not discuss the surprise party. The 2nd rule of the surprise celebration is: Do not talk about the actual surprise party. Getting all the party guests to keep the key is notoriously difficult, however, not impossible.
Having a partner within crime who does not reside in the same house as the visitor of honor makes it easier to maintain party supplies, track RSVPs, decorate the party location and ensure that the guest associated with honor shows up at the most fortunate time and place. Make sure this person will keep a secret (and an aligned face).