Displace anxiety into intensive sign-making and obsessing over which slogan t-shirt to wear! Seriously, it kind of works for me.

I even geek out over which scent to wear (then often opt for Tauer Perfumes Une Rose Chypree, because "bread and roses"). Nobody wil give a shit except me, but it gives me a focus and makes me feel more prepared somehow.

Also "admire other people's interesting/cool signs" is a significant coping strategy for me when it comes to tolerating crowds and physical proximity to people at protests.