You could do a bi-weekly retro to catch issues not really appropriate for stand-up. Point was that if commitments cant be made for weeks at a time just shorten

You could do a bi-weekly retro to catch issues not really appropriate for stand-up. Point was that if commitments cant be made for weeks at a time just shorten the iteration time. The core part of Scrum is to regularly collaborate as a team on assessing the situation and organise the next action to improve it. Can happen hourly if needed.