Altadena Heritage will host a garden party and its fifth annual Golden Poppy Awards next Sat., June 7, 5-7:30 PM.   The party will be held at Ann & Chris David's home, 1077 Altadena Dr., built in 1923 and designed by Lawrence Stimson, who also designed the Wrigley Mansion in Pasadena.  Altadena Heritage will also present its Golden Poppy Awards to eight of Altadena's most creative gardeners.  Hors d'oeuvres and beverages will be served.  TIckets are $20, $15 for members, and reservations must be made by Monday, June 2 to Altadena Heritage, 797-0054, or altadenaheritage@earthlink.net.