The big clue will be how they come in. If they stage outside of town and stand around, they aren't going to do shit. If they stage off the local NG base and split up into several different groups (One to establish a FOB, a couple of seize control of vital areas and critical infrastructure, and a group armed up and spreading out) then it might be different. If they come in during the day, they're doing a show of force and will want people to see their armed. If they kind of slip in with the cops, they're there so the governor and mayor can say they called out the National Guard.
Also, take a look at what kind of unit is going to be sent in and the shape of the people they send in. If they send in people who couldn't win a fist fight with a pizza box and have them in groups of three or four, they're there just to say the guard was deployed.
You can BET they aren't going to go in like it's LA, in overwhelming numbers, locked a loaded, with APCs and Bradleys.
The governor already spread his ass cheeks for BLM talking about "muh rasyst sosighetee" bullshit.