Why does an event item say sold out or the pickup time is full?

Vendors set how many of each item they can sell per day, and how many orders each pickup time can handle. Sold out on this date means that day's quantity for the item is used up; try another date. Full means that pickup time has no places left; choose another time. A vendor can also close an item for specific dates, or pause it, in which case it shows as no longer available. Unpaid reservations hold stock for 15 minutes, so an item may become available again if someone does not finish paying.