July 3 - 6th Annual Old Fashioned Community Picnic, San Moritz Ball Field Crestline July 3 - Discovery Center Summer concert Series, Big Bear Discovery Center July 4 - Lake Arrowhead Fireworks. July 4 - Crestline Jam Days & 4th of July Parade. July 4 - Big Bear Fireworks Show. July 12 - Old Miners' Days - Big Bear