Bulletins
A bulletin is an announcement your whole board can't miss: the banner about this weekend's event, the heads-up about new rules, the welcome note for a wave of new members. They're managed in Appearance, then Bulletins.
yourboard.forumspark.net/admin/bulletins
Every bulletin with its position, status and schedule.
Anatomy of a bulletin
Title and content, written in the editor. Short works best; a bulletin is a poster, not a topic.
Position. Where on the board it appears; different placements suit different volumes, from a quiet notice to front and center.
Dismissible or not. Dismissible bulletins can be closed by each member once they've read them, and stay closed for that member. Non-dismissible ones stay until you take them down; save those for things that really matter.
Schedule. Give a bulletin a start and end date and it handles itself: the event banner appears Monday, vanishes Sunday night, and you never think about it again.
One bulletin at a time is a message; three at a time is wallpaper. If everything is an announcement, nothing is.