These are Ravnica based MtG events with prizes and a special twist, these events now include Ravnica D&D games! This is along with stuff like Guild Kit battles and other things. It'll be interesting to see if it means that stores that normally don't sell D&D normally will do so specially for this weekend.
https://magic.wizards.com/en/articles/archive/news/introducing-magic-weekend-2018-10-29
https://magic.wizards.com/en/articles/archive/news/introducing-magic-weekend-2018-10-29
