The dance card at left (click to enlarge) is an interesting one: rather than being for a private event, it is from a public dance hall, the Dance Pavilion at the Ocean View Amusement Park, Norfolk, Virginia, which was one of the first amusement parks in the United States. Sadly, I do not own this card myself; it slipped by on eBay and is now in unknown hands.
The card is printed in monochrome, with a small picture of the Dance Pavilion. No orchestra or dance leader is mentioned, only the name of the company that owned the amusement park and its owner, Otto Wells. In keeping with its commercial nature, there is actually an advertisement on the inside. On the back of the card is a note that "objectionable dancing" is "positively prohibited", an admonition which would be unnecessary at a private ball but a potential problem at an event open to the general public, and directions to the check room; ladies' retiring room; and gentlemen's smoking room. The card is not for a specific evening's event, but instead is a generic dance program for any evening of the 1917 season. Written in pencil at the top of the front page is the date "Saturday, June 9, 1917".
There is no sign of any attachment point for a pencil.