THE Mostly Mozart Festival celebrates its 35th season with Pinky and the Pearl (alias Pinchas Zukerman and Itzhak Perlman), a Requiem and a farewell.

The festivities start tonight, weather permitting, with a free, al fresco performance at 8 p.m. in Damrosch Park at Lincoln Center.

Gerard Schwarz – the 20-year festival fixture whose farewell season this is – will conduct the Mostly Mozart Festival Orchestra and trumpet soloist Sergei Nakariakov in Mozart’s Symphony No. 20, Haydn’s Trumpet Concerto and Beethoven’s “Pastoral” Symphony.

Tuesday and Wednesday, Pinky and the Pearl will team on viola and violin, respectively, in Mozart’s Sinfonia Concertante.

In its second week, the festival will feature music on period instruments by the group Europa Gallante (Aug. 5 and 9) and a rare performance of Haydn’s “The Seasons” (Aug. 12).

Weeks 3 and 4 bring pianist Garrick Ohlsson to a program that includes the Beethoven Piano Concerto No. 1 and Tchaikovsky’s gorgeous Variations on a Rococo Theme; the Mozart Requiem – pivotal to the film “Amadeus” (Aug. 21 and 22) and the Tokyo String Quartet with pianist John Browning in Schubert’s “Trout” quintet (Aug. 23).

Panist Alicia de Larrocha will close the festival Aug. 24-25 with an all-Mozart program including the “Haffner” and “Jupiter” concertos and the Piano Concerto No. 23.

For scheduling information, call the Mostly Mozart hot line at (212) 875-5399. For tickets, visit the Mostly Mozart site at http://www.lincolncenter.org or call CenterCharge, (212) 721-06500.