To take liberalities with Chesterton:
"The Motu Proprio is like a thick steak, a glass of red wine, and a good cigar..."
He said this of the Church of course, but it seemed fitting. In all seriousness, if you personally, a lay group in your area, your parish, your classical rite community or otherwise are hosting any liturgical/spiritual events in celebration of the Motu Proprio and/or any otherwise festive and celebratory get-togethers (meals, drinks, and so on) that you'd like to share with people who might like to join you, please feel free to list them in the comments here.
Or, if you'd just like to share what you are doing, feel free, from, again, devotional celebrations in the home, to feasting and the like.