Who knows when the market mountain in Changyi, Shandong Province will have a specific time?

If you are in Changyi, the market is on the first day, the sixth day, the eleventh day, the sixteenth day, the twenty-first day and the twenty-sixth day of each month. There is a meeting every five days. If there is a mountain products meeting, Changyi is twice a year, but only Beimeng Town belongs to Changyi, and there are four mountain products meetings a year.

Usually we wait for the meeting, but the exact date of the meeting has been forgotten. .