Oh, I'm really disappointed!!
I already knew about the Advent Calendar so when you posted about an Adventure Calendar I instantly imagined a calendar containing exciting ideas for adventures a la Sussexes
Getting married in a backyard three days before everyone thinks you're getting married
Arriving too late to board a minibus with other Royals, so arriving at St Paul's in a limousine
A trip to New York in a private jet to attend a baby shower
A Freedom Flight ~ very exciting when the pilot kneels in front of you and thanks you for your service
A car chase through New York
A Netflix series when you can demonstrate your finely-honed home-making tips with the whole world
Returning to the UK in a private jet and complaining about anything and everything which is permissible when you are a Royal Prince of England
Unfortunately I've realised 'Adventure' should have read 'Advent' ~ what a missed opportunity for M
Edited for clarification