Fifty young men and women, members of the Israeli Communist Party’s youth movement, “Banki,” departed for Cuba Tuesday to attend the 11th International Youth and Students Festival there. A delegation of PLO youth is also expected in Cuba. Yoram Gozansky, who heads the Israeli contingent, said he hoped the two groups could meet and talk. A small number of non-Communist leftwing artists joined the young Communists. They will take part in the national art exhibitions which are being held during the youth festival.