I'm thinking of just inviting a few local families over for cake to celebrate my LO's 2nd birthday. My question is if that constitutes as a party? I am envisioning more of a play date + cake in the afternoon. Do I have to send out paper invites or would an email suffice? I just want to do something low key but I don't want it to seem lame. If so, then I just won't bother. Just wanted to get everyone's opinion!