Following is the program for the pop concert in Symphony Hall this evening: Williams College Night. 1. Entrance of Guests into the Wartburg (Tannhauser) Wagner Organ, Mr. Marshall. 2. Overture, "Mireille," Gounod 3. (a) Alma Mater. D. W. Marvin '01 Organ, Mr. Herrieck Brown. (b) Royal Purple, Goodwin '95 4. Intermezzo, "The Jewels of the Madonna," Wolf-Ferrari 5. Selection, "The Firefly," Friml 6. (a) Our Mother, C. F. Brown '09 Organ, Mr. Herrick Brown. (b)Eph Williams, arr. H. C. Taylor '90 7. Waltz, "The Skaters," Waldteufel 8. Kammenoi Ostrow, Rubinstein Organ, Mr. Marshall. 9. Ride of the Valkyries, Wagner 10. Selection, "Carmen, "Bizet 11. (a) 'Neath the Shadow of the Hills," Banks '90 Rise Up, Hepburn '00-Kent '63 (c) The Mountains, Washington Gladden '59 12. American Patrol. Mecham