Jewish and Chinese cultures are intertwined this coming weekend when the Museum at Eldridge Street throws a big street party: the Egg Rolls & Egg Creams Festival.  The popular event will feature performances of Peking Opera, klezmer music, Chinese folk music, cantorial singing; demonstrations of Hebrew and scribal art, yarmulke making, tzit tzit and Chinese knot tying, paper folding and papercutting; mah jongg games, a tea ceremony, challah making, tours of the Eldridge Street Synagogue and more.  The free festivities take place from noon-4 p.m. on Eldridge, between Canal and Division street.