Can you cite this? Everything I have seen has said the opposite, that they have been unable to link the protests to spikes. Maybe I just didnt see those articles, but I have seen several that said the opposite, particularly where you see spikes where there weren't protests and haven't seen spikes in places were there were protests.
From June 30th article in Time Magazine:
"But public health officials have spotted at least one bright spot amid all the discouraging data: the nationwide Black Lives Matter protests, which began after George Floyd’s death at the hands of Minneapolis police in May, so far do not seem to have been dreaded “superspreader” events, as some feared they might. Several cities that saw major protests, including New York, Chicago, and Philadelphia, have not experienced a new surge in cases in the days and weeks following. And in cities and states that specifically set out to test protestors, like Massachusetts, Seattle, and Minnesota, the results have shown that demonstrators were not considerably more likely to test positive compared to the general population."
It does go on to say:
"We may yet see a protest-related spike in coronavirus cases. Many of the demonstrators were young, and thus likely to develop only mild symptoms from COVID-19, if any at all. But even asymptomatic or mildly symptomatic people can carry the virus to older, more vulnerable people in their homes or communities. If that’s happening, it would take more time to show up in the data."
And maybe that will be the case, but everything I have seen has said that at least so far, there isn't any evidence that the protests lead to any spikes.
Now maybe this suggest that fans at games would be fine if they were outside and masked (as this article suggests may be the reason there hasnt been a spike tied to the protests)....