During The Torah-reading of the Ten Commandments, stand and face the Sefer Torah.
Akdamut (p. 400) is not said.
Wednesday Sivan 6, 1st Day of Shavuot 5703
Chumash: Nasso, Revi'i with Rashi.
Tehillim: 35-38.
Tanya: Likutei Amarim (p. 283)...blessed and exalted. (p. 285).
The Baal Shem Tov passed away on Wednesday, the first day of Shavuot, 5520 (1760) and is interred in Mezibuz.
The Alter Rebbe Commented (on Wednesday, the 20th of Kislev 5559 (1798) in Petersburg):
"On the fourth day the luminaries were taken away." [1]
Notes:
On the fourth day of Creation (Wednesday), the luminaries (sun, moon and stars) were hung (Nitlu with a Tav) in the expanse of the heaven. The Rebbe's comment is based on reading Nitlu with a Tet ("taken away") instead of a Tav.