The way myself and my party does it is we play every other week on Saturday from 6pm to 10pm. This way everyone knows the schedule and can plan around it. If people can’t clear their schedule to play then we replace them. It’s harsh but it’s the only way I found to play D&D consistently.
And I myself have excused myself from a game because my life schedule changed and couldn’t keep the commitment I had previously and it would be too much work for the rest of the party to change their schedules.