For my sons first birthday, we are doing a time capsule. The invitations will have a picture of him as a new born and at 12 mo. The invites will be mailed out in a mailing canister. Each guest is to bring something to place in his time capsule which will be opened on his 18th birthday. Each guest will get to say what they are putting in and why. The tape of the party will also be placed in the canister.