Other forms: engagements
If you are a musician or performer and you arrange for a performance, then you have booked an engagement. You might stand in line for tickets when your favorite comedian books an engagement at the local theater.
An engagement can also be a general appointment. A previous engagement is the perfect excuse not to go to the opera with your grandmother. An engagement also means an agreement to get married. The news of your engagement might please everyone you know except your fiancé's ex-girlfriend. A military engagement is a hostile meeting of military forces on opposing sides of a conflict.