[hnbad]

I'm not sure whether there have been any pro-Palestine or even simply "anti-war" protests that were properly registered, not disrupted and not dissolved by the police but I guess it depends on your definition of "legally".

I would say in practice it's very difficult to have any protest opposing Israel's actions in Gaza without a high risk of ending up in a place where the police decides to dissolve it. But I think in practice the two biggest reasons for that are a) the topic is likely to attract protestors who decide to express opinions that are illegal (or are deliberately interpreted that way) and b) most protests tend to be dissolved by the police eventually because even ones that follow all the rules usually spin off or feed into spontaneous protests that don't.