DS (2.5) desperately needs more 1:1 social interaction with other children. He's an only child, zero interest from extended family overseas, spends too much time with one or both parents and nowhere near enough time seeing other people. We have a few friends with children similar ages, but they are busy and have lives. We need to find more people - playdate friends, surrogate grandparents - people with whom we can model social interaction.
Also relevant: DS is being investigated for ASD but increasingly it looks like he might come away with "autistic traits" but no diagnosis. He shows signs of huge anxiety around other children in groups, but is generally fine 1:1 with other children in quiet, unstressful situations. The basics of interaction all seem to be there. Everything the SALT and OT ask him to try, he can do just fine (turn taking, perspective taking, 1:1 play, pretending/imagining, playing games with rules, holding a conversation...). But group situations with marauding confident other children are a nightmare - DS doesn't want anything to do with the kids, wants to go home, etc.
He goes to nursery, but I don't know any of the parents there and there's no obvious context to meet any of them. We used to go to playgroup but DS found it very stressful and the people were hugely judgemental about his behaviour, constantly criticizing him for crying and not wanting to do things, saying I was a useless parent, etc. We go to child-development-service music and swimming groups at the hospital, but TBH the kids there are not likely to want to do playdates (DS is the only one who is verbal; the other kids are clearly quite stressed by any form of interaction with people they don't know).
How do we find more people?