Max J. Silver, track coach of the Bronx Y.M.H.A. and the German-American A.C., will be director of the annual July 4 “Safe and Sane Athletic Committee, it was announced yesterday. There will be special competitive events open only to members of Y.M.H.A.’s in Bronx and Manhattan. The games will be staged at Macombs Dam Park, 161st street and River avenue, Bronx.