Jerusalem Day, celebrated on the 28th of Iyar to commemorate the reunification of East and West Jerusalem. Jerusalem was reunited on June 7, 1967, during the Six Day War, with the entrance of the IDF into the Old City and Jewish holy places.
Aliyah is the word that describes the return of the Jewish People from the exile in the Diaspora back to the Land of Israel. The word Aliyah is derived from the verb "laalot" which means "to go up", or "to ascend" in a positive spiritual sense. A person who makes Aliyah is called an Oleh, meaning "one who goes up".