Having a child who really likes dates has helped us to pursue many different types of timelines. Tapping into this child's love of opera has resulted in the creation of an opera timeline. For our date we use the year of the opera’s first performance.
Normally, after watching an opera on video (we haven’t managed to see one in real life yet although I do hope to bring this child to a live performance), we hang a card with the date.
I can't decide which is more fascinating: opera, or an opera timeline. In any event, I recommend starting a homeschooled Chess Club so the kid can actually make friends.