Yeah I started this the same day as the HRDX but only went to attempt Showdown on Sunday and Monday... I think once you see what the missions are it should be pretty easy to complete if you have the time and the stubs to reenter... I'm thinking these return again when the HRDX goes to Seoul in September and Mexico City in October... I'd imagine it would be the same cards... unless they release upgraded versions of them in September to 97-99... I wish they could've had one in the States or another country for August though making 4 events instead of 3 since there are 4 teams in this.
Also would be cool if they added Home Run Derby X into MLB The Show 23 both as a stand-alone mode in the game as well as a single-player or H2H mode in DD... speaking of which I wish they could do the same for Home Run Derby as well... I think you can play against people online but it would be cool if you could do this in DD with options to use a card from your collection or you could even do a "MyBallPlayer only" HR Derby online or within DD.