A science museum first announced that a workshop would run on Tuesday and Wednesday. Two days later, the museum posted a correction: the Wednesday session would remain, but the Tuesday session would move to Thursday because a gallery needed emergency repairs. The museum kept the original notice online and placed a correction link above it. A volunteer saved both notices, recorded the date of each post, and marked only the Tuesday-to-Thursday change in a planning sheet. She did not rewrite the unchanged Wednesday session or assume that the workshop topic had changed. Before sending reminders, she opened the museum’s official page again rather than relying only on an old screenshot. She also copied the page address, because the image alone did not show whether a later correction had been added.