You don't need 5G to get that, you can get usable speeds to over 100k people in a roughly 200m x 100m area with wifi and 4G, as OSU has done (1,2).

1 https://www.bizjournals.com/columbus/news/2013/08/27/ohio-st...

2 https://www.dispatch.com/news/20180405/ohio-state-to-spend-n...