Nearly 10,000 music lovers descend on Ninilchik each year for Salmonfest, making it the largest music festival in Alaska. That also means it generates a lot of trash. Next Monday, Kachemak Bay Family Planning Clinic is offering a free showing of “Are you there, God? It’s me, Margaret,” a film based on Judy Blume’s classic teen novel on August 11th at Porcupine Theater.