The term 'Annual Opener' can be broken down into two crossword solutions: TRI and SEMI. TRI stands for 'triathlon, ' which is an endurance event consisting of swimming, cycling, and running. A triathlon is usually held over the course of one day and is a popular event among athletes. SEMI stands for 'semifinal, ' which is a round of competition in a tournament or other sporting event that precedes the final round. The semifinal round is typically used to narrow down the field of competitors to the two best teams or individuals who will then compete in the final round.