Join the Loudoun County Public Library for trivia night at Old Ox! Gather your friends and put your useless knowledge of monsters, myth and magic to the test. You can also compete in the Halloween costume contest and take home cool crafts. Registration begins at 6 p.m. for teams of two to six. There will be five rounds of seven questions each, with bonuses and a final jeopardy. To the winners go prizes and bragging rights! For ages 21 and older. https://bit.ly/2pNMMd7