the answer is all of the above, and if you're serious then you have to shut everything down. the virus doesn't know that it's at school, and should behave, or spread more easily at bars than it does at churches. these are arbitrary human conventions that make no sense and have no rooting in science - but they can be deceiving, if you're a conservative (which everybody that is making decisions, right now, is).

opening schools and gyms and closing bars and strip clubs isn't "risk reduction", it's just base stupidity rooted in illogical puritanical ignorance.

it will make the idiots feel safer, though - and that's really the purpose of it. it's political. it's meat for the base.

they're scapegoating sinners. 

and, that is all.

so, if you're looking for an easy answer, there isn't one; if you're looking for a specific activity to cancel so that everything else carries on safely, you're doing this wrong.

if you want to target any specific group, the group you should be targeting is geriatrics. and, it doesn't matter if they're playing bingo at the tavern or singing hymns at the church or giving their grandkids a hug - any outside exposure is dangerous.

that is the only intelligent thing that can be done, and suggestions otherwise will merely lead to abject failure and excess death.

https://nationalpost.com/news/canada/gyms-bars-backyards-why-we-dont-know-more-about-where-covid-19-is-spreading-in-ontario