Yu County or Yuxian, a county in Yangquan City 陽泉市|阳泉市[Yang2 quan2 Shi4], Shanxi

see 盂蘭盆會|盂兰盆会[Yu2 lan2 pen2 hui4]

Feast of All Souls (fifteenth day of seventh lunar month) (Buddhism)

If the basin is square, the water in it will also be square. (idiom)