Why not inform your friend of the outcome? Half of the group chats seem to be utter nonsense until a final outcome is made, particularly with arranging something.
Or would you not want your friend to attend?
The choice is: do I want my friend to be included in my activities?
The choice is not: do I want my friend to be included and also send all of his data to some people I've never met?
Your idea of friendship is rather strange. It appears to involve other people arranging your social life for you on your behalf, and then presenting the plans to you for your approval via the communication method of your choice.
