
This market resolves YES after the MLB officially announces that a team will be based in Las Vegas, Nevada, and that team plays a home game in the Las Vegas area. Only the official announcement needs to occur before 1 January 2030; the home game may occur after 1 January 2030.
People are also trading
A's officially leaving Oakland after 2024, will play in Sacramento through 2027 until Vegas stadium is ready
https://www.cbssports.com/mlb/news/as-officially-leaving-oakland-after-2024-will-play-in-sacramento-through-2027-until-vegas-stadium-is-ready/
[MLB Commissioner] would be disappointed if A’s Las Vegas ballpark not open by 2028, skeptical of Olympics
"Manfred said a decision to expand to 32 teams could be made within five years but the new teams wouldn’t start play until 2029 at the earliest."
https://apnews.com/article/mlb-owners-as-olympics-eb8546d78d9b556488d4748395dbf584
The first requirement for YES has been met:
https://www.mlb.com/athletics/news/athletics-statement-on-relocation