“Bienvenido Gustavo” Walt Disney ConcertHall (October 3–11). Gustavo Dudamel is a conductor who’s enjoyed almostpop-star hype at the head of Venezuela’s Simón Bolívar Youth Orchestra, as well assince being named Esa-Pekka Salonen’s successor at the Los Angeles Philharmonic. Now,finally, the 28-year-old is assuming his post with a week of concerts, starting with a free eventat the Hollywood Bowl (lines went around the block the day tickets were released), continuing withthe season opener—a John Adams world premiere—and going on through the weekend with anew work by Unsuk Chin and Mahler’s First Symphony.