no harm in postponing - people who joined on a sunday might not be able to join in on a monday when their anniversary rolls around, shifts also have a tendency to change ......
as long as they give us a time they'll be here that day, or at the latest, the following day that should be ok ....
That is what happened to me , I joined on a Sunday but the anniversary was Monday when I was at work so we set a time, and it worked out perfectly.



