What is distinct about the grain offering during the festival?
Leviticus 23:13 (ESV)
13And the grain offering with it shall be two tenths of an ephah of fine flour mixed with oil, a food offering to the LORD with a pleasing aroma, and the drink offering with it shall be of wine, a fourth of a hin.
Normally, the offering is one-tenth of an ephah (Leviticus 14:21). On this occasion, however, it is two-tenths of an ephah. The doubled weight emphasizes the importance of this festival.
13 And the grain offering with it shall be two tenths of an ephah of fine flour mixed with oil, a food offering to the LORD with a pleasing aroma, and the drink offering with it shall be of wine, a fourth of a hin.