Having suggested time, day and location, we still needed to decide the dresscode.
Jim: Can we dress up as hippies?
Me: Well I can.
If all your clothes are too smart*, we can always make movie night into tie-dye night.
*"He'll be the one in a suit"
Jim: A tie-dyed suit? Formidable!!
Claire was more concerned with the entertainment:
Claire: Oh forgot to mention I shall be attending the soirée this Friday. Will we have a replica stonehenge to dance around?
Me: I'm not sure we'd got so far as planning,,, um... anything. But I'll draw a design for stonehenge on a napkin. 
Fortunately Paul was just enthusiastic:
Paul: Sounds good Neil.
I’m looking forward to us having a quantum of summer solstice
A full set of email groans went up in response.
 The first time Jim went to Glastonbury Festival, one of his co-workers told her daughter to watch out for him on TV. "How will I spot him?" she asked. Jim always dresses to give off an air of professionalism at work, so the co-worker replied "He'll be the on in the suit."
 The Stonehenge sequence from This Is Spinal Tap. Jim for some reason thought that some sort of Rick Astley hitwould be more appropriate.