Chag Shavuote or the Feast of Weeks occurs on the 50th day after Passover, it is a Holy Day celebrated by bringing two loaves of bread. The omer is counted starting the night after Passover and ends on the evening of this day. This day is observed as a Sabbath day, no work or anything secular is to be done this day. Reference: Exodus 12, 13 & Leviticus 23