The officers' quarterly is like a special meeting for the leaders in a group or organization, where they talk about important things that are happening and make plans for the future. It's called a "quarterly" because it happens every three months, which is four times a year.
During the officers' quarterly, the leaders might talk about things like how the group is doing, what goals they have for the future, and how they can improve. They might also discuss any problems or challenges they're facing, and figure out solutions together.
Think of it like a playdate with your friends, but instead of playing games, the grown-ups talk about important stuff and make plans to make the group even better!