Youth orchestras Siam Sinfonietta, who recently won first prize in the Summa Cum Laude Festival in Vienna, returns from touring America and Germany to perform pieces like Rossini’s La Gazza Ladra, Wagner’s Siegfried Idyll and Haydn’s Symphony No. 101 in D, conducted by Somtow Sucharitkul. Entry is free, limited to 200 seats.