some have church halls.
Not all churches are condusive to a stadium setting.
(actually this resembles a passage in Heilein’s Stranger in a Strange Land where the altar of a church had a big screen holoviewer in the back for the “big games”)
True, especially older, traditionally styled church buildings. But, many of these have church halls, as you noted, and a lot of the newer churches are built with ample seating and projection screens for displaying announcements, words to songs, or scripture verses.