Last irl meeting I had with comrades we talked about how we need to have something like this, a basis for meeting up beyond volunteering-style political participation. Thankfully we all like each other on a personal level and take turns cooking each other food so that's enough for us but for a broader-base movement you do need a hook to get people in that isn't just politics.
As always the right have an advantage here because they have extensive funding and patronage networks with the rich. For obvious reasons leftists, in their diametric opposition to rich people as such, do not have this. There is that singular ML billionaire and that other hundred-millionaire leftist guy in the US southwest but that's about it.
Seriously though, maybe some of these people can be informed of an actually effective and systematic way of dealing with the crises they say they care about?