January 21, Martin Luther King, Jr. Day. Celebrate the legacy of Dr. Martin Luther King, Jr., and volunteer to remove invasive ginger on Halema‘uma‘u Trail, 9 a.m. to noon. Meet at Kīlauea Visitor Center. Bring raingear, long pants, long-sleeved shirt, hat, water, hiking shoes, gloves, loppers and snacks and/or lunch. Walk-ins welcome. For details, contact Park Ranger Adrian Boone by phone (808) 985-6019, or email email@example.com. Entrance is free all day.