Mad Hatter Tea Party Invitations. Even if you're running late, there's always time for a cup of Tea and we make it easy with same day shipping on all of our Teatime Mad Hatter Birthday Party Supplies! 8 Invitations/8 envelopes, 8 envelope seals and 8 save the date stickers. Front: You're Invited! Inside has spaces for the guest of honor, date, place, time and to RSVP. Approximately 4.5in x 6in.