Just out of interest...my youngest, autistic son has his 18th birthday coming up- and my mum keeps wanting to arrange a party.
He is an introvert- fine, and autistic- fine- and just would not enjoy it. My mum has the best will in the world... but I have seen quite a few people trying to persuade others to "enjoy themselves", in "their" way. And I have said to her... "it depends if it's for us or for him".
Would you, personally, try to get someone to "have fun". Is it their problem to join in, or ours?