Northern Nights Music Festival | 433 followers on LinkedIn. Make The Journey! | Northern Nights Music Festival (NNMF) is a 3-day celebration of music, art, food and local culture that takes place annually the 3rd weekend in July in Northern California. This year NNMF will be July 19th-21st, 2024 at Cook's Valley Campground on the South Fork Eel River. This area has hosted many acclaimed music festivals and renowned talent over the past 30 years.