I think it's fairly common practice to meet up with the foster carer 6-8 weeks after placement for an hour at a neutral place. My oldest daughter said after a while that the FCs could go home now, whereas my then youngest, now middle, son had a serious meltdown and we had to carry him away kicking and screaming. We've not met them again, not because of that experience, but it wasn't planned and we wanted to get on with life. They send us a card at Christmas every year and we do that too. We always add a few lines about them, not just Merry Christmas.
When we adopted their younger sibling some years later, no FC follow up meeting was set up by social services, possibly because he was so young and we were OK with that. He settled easily and had that been different, we might have considered setting up a meeting with them. She sends him a card at Christmas and for his birthday. We send them a card too at Christmas, again with a few lines about him.
We're very slowly starting life story work. My oldest daughter, now 9, starts asking questions, so we now sometimes talk about her life journey from birth parents via foster carers to us as adoptive parents.