According to the Torah there are three festivities that the Jews must go to Jerusalem: Pesach [Passover], Shavuot [Festival of Weeks] and Sukkoth [The Feast of Tabernacles]. And during the Chol-Hamoed (the intermediate days of these three Holidays, which means the 2-6 days)of Passover and Sukkot there is Birkat Hakohanim [Priestly Benediction] at the Kotel [Western Wall]: “Thousands of Kohanim (descendants of the priestly tribe) join together in one voice to bless the Jewish nation.” It was an amazing experience!!(This pictures were taking from the web site)