The DC museum’s East Wing opening of “Toulouse-Lautrec and Montmartre” draws more than 9000 visitors its first day. “Museum guards with clickers stationed at the entrance to the 10-room exhibition — a kind of tour of Paris night life in the late 1800s — counted 9,230 visitors. That easily surpasses the 6,190 who attended the opening of “Treasure Houses of Britain” in 1985 and the 3,340 who came for the first day of “Johannes Vermeer” in 1995. The West Building’s attendance record was set in 1963 when an average of 19,205 visitors a day saw Leonardo da Vinci’s “Mona Lisa.”