misevent

/ˌmɪsɪˈvɛnt/
noun
  1. An event that goes wrong or turns out badly; a mishap or unfortunate occurrence.
    • Every camping trip seems to have at least one misevent, like a torn tent or lost gear.
    • The wedding was full of small misevents, from a broken cake to a sudden rainstorm.
    • The play's opening night was a misevent when the lead actor forgot his lines.