Rosh Hashanah

Rosh Hashanah begins ten days of penitence culminating in Yom Kippur, as well as beginning the cycle of autumnal religious festivals running through Sukkot which end on Shemini Atzeret in Israel and Simchat Torah everywhere else. (Wikipedia)

They're selling flowers on a Wednesday:

Eating symbolic foods, such as apples dipped in honey, hoping to evoke a sweet new year, is an ancient tradition recorded in the Talmud.

Three books of account are opened on Rosh Hashanah, wherein the fate of the wicked, the righteous, and those of the intermediate class are recorded. The names of the righteous are immediately inscribed in the Book of Life and they are sealed "to live". The intermediate class is allowed a respite of ten days, until Yom Kippur, to reflect, repent, and become righteous; the wicked are "blotted out of the book of the living forever."

The best-known ritual of Rosh Hashanah is the blowing of the shofar, a musical instrument made from an animal horn.

This is when I see the fellows down by the water praying: The ritual of tashlikh is performed on the afternoon of the first day of Rosh Hashanah by most Ashkenazic and Sephardic Jews (but not by Spanish and Portuguese Jews or some Yemenites, as well as those who follow the practices of the Vilna Gaon). Prayers are recited near natural flowing water, and one's sins are symbolically cast into the water. Many also have the custom to throw bread or pebbles into the water, to symbolize the "casting off" of sins.

The Hebrew common greeting on Rosh Hashanah is Shanah Tovah.