In my senior year, our student marketing club's biggest annual event lost its lead organizer three weeks out when she had a family emergency. Nobody on the committee had run it before, the venue and speakers were only half-confirmed, and the group's first instinct was to cancel.
I didn't have a board position, but I'd shadowed the previous year's planning, so I asked the club president to let me coordinate. I mapped everything left into a shared checklist, split it across five volunteers by strength — the detail-oriented one got vendor confirmations, the outgoing one got speaker wrangling — and set a nightly ten-minute check-in call. When two volunteers fell behind midway, I redistributed their tasks instead of pushing harder, which kept the mood from souring.
The event ran on schedule with our second-highest attendance ever. The part I'm proudest of isn't the event — it's that the checklist system became the club's standard planning template after I graduated.