There is no overarching antifa organization though. Try looking for a website/forum/etc of antifa. There are websites for random local activist groups which call themselves <city name> antifa, but there is no leader or comittee overseeing these groups. There is no process to join antifa, any activist group or individual can call themselves antifa.
So there are no calls made by antifa, good or bad. There are only calls made by individuals or local groups that call themselves antifa.