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Today, 20 Oct, is えびす講 in Kansai and Kyoto's 誓文払い. In much of eastern Japan the same observance falls a month later, on 20 Nov. Not two festivals. One, counted two ways.

The gap has a name: 月遅れ, 'a month late'. Japan dropped the lunisolar calendar for the Gregorian one in 1873. Festivals kept their numbers, and some were pushed a month later so the season still fit.

お盆 went from 7/15 to 8/15 nearly everywhere. 神嘗祭 was moved from 9/17 to 10/17 early on, because the rice wasn't ready.

Others refused to move. 重陽 is one of the 五節句, dated by its numbers, with no harvest logic attached, so it stayed on 9/9 and drifted a season instead. One calendar reform, two ways of surviving it.