I do think that for a special occasion, such as a dinner party as in the OP, most people make an effort with their appearance.
The dress that looked gorgeous in the mirror at home with appropriate shoes might not look so good in stockinged feet!
Prior warning would allow guests to adjust their attire accordingly and/or take alternative footwear - I think you can get mules with a small heel, can't you? 
How can *anybody* still see this man as any kind of statesman or world leader?
Aricle on what it's like to work as professional psychic witch




