On my whiteboard, I have one week shown as a grid with one square for each day. For a five day week, if there will be any sort of test, quiz, lab, or project that's scheduled or due, I place these 'signs' on that particular day.
After printing them (they are color), I glue them to card stock and laminate them; I then add magnets, and they're ready to go!
Students love seeing them when they walk in on Mondays - it's a quick visual and keeps them on track. Plus, it's more visually appealing and easier to see for students.
Download includes four labels total: Lab week, test week, quiz week, project week.