That's a good point, thanks for saying it. Speaking as one of such developers who had trouble with it for a long time, plenty of us might end up feeling shy or insecure about making proactive interventions to secure time for ourselves or our teams - all while our managers might be assuming we'll make such moves when needed. Sometimes all it takes is an explicit permission from a person in position of power - them saying to subordinates, "it's fine if you block off focus time for the team in the company calendar". And, per your example, it's even better when followed by assurances of support, such as being an organizer or confirmed invitee. For better or worse, a lot of inter-team dynamics ends up being about looks.