I try to make plans for my dc at the weekend and will text a mum to see if they are free but sometimes I don’t hear back for a day or two. In the meantime I might get an invitation with someone else or an opportunity to make other plans or invite other people so when I do hear back they have a double date.
AIBU to think if you don’t get back soon you can’t expect plans to either just involve you or for people to still be free.