Mr. Maquarre will conduct the orchestra at the Pop Concert in Symphony Hall tonight for the first time this season. The program is as follows: 1.  March "En Avant,"  Farbach 2.  Overture, "Hans Heiling,"  Marschner 3.  Waltz, "Grubenlichter,"  Zeller 4.  Selection, "The Firefly,"  Friml 5.  Ballet Music from "Sylvia,"  Delibes   (a) Les Chasseresses.   (b) Pizzicato.   (c) Cortege de Bachus. 6.  Meditation, "On a Theme by J. S. Bach,"  Bordier 7.  Selection, "La Boheme,"  Puccini 8.  Hungarian March,  Berlios 9.  Overture, "Le Roi d'Ys"  Lalo 10.  Nightfly Dance,  Maquarre 11.  "Canzonetta" for strings,  Godard 12.  March, "Sombre et Meuse,"  Planquettee