I went to a different one. 2 skinheads skulked around the outside but did nothing, then got bag searched by the police and told to go home. The whole counter protest turned into a celebration, with people marching the streets with slogans, music, singing, dancing, drinking, and so on and on. Just a big left-ish street party of all ages and races.
It was actually very heartwarming. I overheard a lot of great things. In particular, especially from older immigrant men, who expressed grateful surprise at the numbers and mixed demographic of the anti fascists. Many said they felt loved by the city. A very merry time.