The Detroit Free-Press reported that Michigan Governor Gretchen Whitmer issued an executive order to allow ice rinks in the Lower Peninsula to reopen on Friday, October 9. Also reopening on that date are movie theaters, “bowling centers, indoor climbing facilities, trampoline parks, and more.”
This is potentially a vast expansion of the number of people allowed to gather indoors, but the number in each facility will depend upon the size of the building.
This article also explains the reason why the hockey tournament in Traverse City where the COVID-19 outbreak occurred was allowed to take place in mid-August; Ice rinks in the northern part of Michigan including the Upper Peninsula, Grand Traverse County and 16 other counties in the extreme northern part of the Lower Peninsula had been allowed to reopen on June 10.