It's not a "local sports win" -- it's a profitable, billionaire-owned corporation stealing public tax money by brainwashing everyone into thinking it's "local". The majority of the players aren't from the area either and will leave after.
There are probably some Montessori schools that opt for other formats, but I doubt that children are set up for success by neglecting math or other topics they are uninterested in. I would wager that even Montessori schools require study of the core tested curriculum.
If you have ever been a guest teacher then you would observe that a substantial minority of students must be guided to pay attention to the material. Autodidacts are not representative of the majority of people.
Re: sports: all things have negative aspects to them. Being a grump to such an extent as to discount all positive culturally cohesive aspects of a largely benign activity is a suboptimal way to live life. Choosing to build on commonalities in a community leads to better outcomes. Believing sports to be a net bad activity is a single-digit percentage minority opinion.
Celebrating a local sports win is about as apolitical and low-harm as possible when it comes to promoting a shared cultural bond for a community.