Each year, countless lightning bugs converge upon the national park, flickering among the trees in one of the country’s most beautiful forest-scapes. Details regarding this year’s dates and how to get access (a limited number of people can attend) have just been released.

The Great Smoky Mountains National Park just announced the dates for its annual synchronous fireflies event, during which swarms of lightning bugs will light up the park at night. The once-a-year phenomenon is so popular that a lottery system has been established for obtaining the coveted parking passes required to attend.

Read more at Afar.