I heard a great podcast with Frank Ostaseski where he talked about how isolating death is. No one wants to bring up what happened, because it may upset you (spoiler: you are already upset) and you don’t want to burden others by talking about it. This traps you into dealing with it alone. I think the best thing you can do is just be available. Tell them you are genuinely want to listen if they want to talk about it. Perhaps make the offer again in a few weeks when others have moved on. No pressure, just be open to listening. Most of us just want to be heard

Never leave without an appointment. When doing routine things like the dentist or yearly car inspection make the next appointment on your way out. If booking your next dentist visit 6 months out you get your choice of any time you like. Just stick it in your calendar and move on.