DS(10) has a friend who regularly asks him around for playdates - probably once a week. They are usually impromptu - eg on the playground after school. Sometimes he goes round to their house with me anticipating to pick him up in a couple of hours, and then the parents call asking if it's ok for him to go to the cinema with them or something.
Me and DH both work FT, so while playdates are possible, they aren't ideal on school nights. And on weekends there is time, but there are also activities to fit in. So generally we do organise playdates, but tend to be planned in advance. Consequently I'm struggling to match the frequency and duration of the playdates with his friend, plus feeling slightly uncomfortable about their generosity in taking him out to the cinema etc.
Just looking for advice on how to approach this. If it helps, DS's friend only moved here earlier this year from another country, so there is probably a difference in culture. I find most other families here do playdates much less frequently.