However, I'm still curious to know if any local tax monies were used to pay for salaries, hotel, food etc at an out-of-state event, which I would consider outside of the intended use of my local taxes.
I'm sure you are......however, nobody cares but you so get over it.
Just check into cop attendance at funerals. There have been many high-profile LEO funerals over the years (such as after 9/11) and probably many were paid for by the union or with funds from a benevolent society. Some, particularly afer 9/11, may have been paid for with special allocations from the local government.
And as for what happens when the cops get there, that’s up to them. Most of those who didn’t turn their backs put their heads down, but if you have a mayor who actively refuses to support the rule of law, what else can you do without resorting to violence?