On Shavuos night, the minhag is to wait until it is night – Tzeis Hakochavim – to daven Maariv in order to have 49 complete days. (Shulchan Aruch w/Mishnah Brurah 494:1).
Likewise, it is preferable for women to wait until it is night to light candles and say Shehechiyanu on Shavuos night. (Luach R’ Yechiel Michel Tukatchinsky, Piskei Tshuvos 494:2)
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Unnecessary.
So what about all those who make an “early” Shabbos every week? Nebach they’re stuck & have to start Bi’zman like the Halacha is.
“the minhag is to wait until it is night”
minhag? it’s an absolute halacha, probably d’Orayssa
the shul in which the picture is from, Khal Adath Jeshuran (Breuers)
normative practice, is to make kiddush, after nightfall. one can daven earlier. see MA, taz, etc.