Calendar: Tours, Talk And Auction
Blossoming Brooklyn Brooklyn Botanic Garden, 1000 Washington Avenue, off Eastern Parkway; (718) 622-4433.
The garden's annual cherry blossom festival will be held on Saturday and Sunday from 10 A.M. to 6 P.M., with tours of the Japanese Hill-and-Pond Garden and the C. V. Starr Bonsai Museum, horticultural demonstrations and Japanese cultural events. Free with garden admission: $3; students and those 65 and older, $1.50.
The spring plant sale will take place on Wednesday, from 9 A.M. to 7 P.M., and next Thursday, from 9 A.M. to 3 P.M.
Artists on the Podium Greenwich Village Society for Historic Preservation; (212) 924-3895.
On Tuesday at 6:30 P.M., the artists Christo and Jeanne-Claude will speak on  their work at Tishman Auditorium, 40 Washington Square South. Reservations are required. A dinner with the art'sts will follow. Tickets: lecture only, $25; students and those 55 and older, $15; lecture and dinner, $300.
Victorian Houses in Brooklyn  Flatbush Tompkins Church, East 19th Street and Dorchester Road; (718) 469-8990.
The Flatbush Development Corporation is sponsoring a self-guided tour of 12 houses on Sunday, from 1 to 6 P.M. Participants may walk or take shuttle buses.  Tickets, $20.
Exploring Philadelphia  Philadelphia Open House; (215) 928-1188.
Philadelphia Open House, a series of 30 self-guided walking tours and tours of gardens and country houses in addition to bus tours, starts today and continues through May 19. Tickets range from $20 to $80.
English Gardens in Town Bergdorf Goodman, Fifth Avenue at 57th Street, seventh floor.
Lady Pulbrook, a founder of Pulbrook & Gould, a leading society florist in London and a training ground for some of the world's most prominent floral designers, will be at Bergdorf Goodman on May 3 and 4 to sign her new book, "Flowers for All Occasions."