Tern of Events--The California least terns will...

Tern of Events--The California least terns will be returning from South America to their breeding grounds on two nesting islands in the Bolsa Chica Ecological Reserve. To welcome them back, a cleanup is scheduled from 9 a.m. to noon Saturday. Volunteers should meet at the walk bridge at the reserve parking lot, one mile south of Warner Avenue on Pacific Coast Highway, and bring boots or sturdy shoes, rakes and hoes. Workers will be transported to the islands by boat. Those who prefer to stay on the mainland can help remove debris left on the wetlands by winter storms. The islands, normally off-limits to bird watchers, are used by terns to nest and fledge their young. Information: Bolsa Chica Conservancy, (714) 846-1114 or Amigos de Bolsa Chica, (714) 897-7003.

Musical Note--Pianist Patricia Waters will give a recital at the Huntington Beach Central Library at 3 p.m. March 23 to benefit the Amigos de Bolsa Chica, an organization dedicated to preserving the Bolsa Chica wetlands. The program will feature music with water and nature themes, and is presented in memory of her father, George W. Waters, who was a member of the Amigos and the Sierra Club. The library is at 7111 Talbert Ave. For reservations, send $10 per person to Amigos de Bolsa Chica, P.O. Box 3748, Huntington Beach 92605. Information: (714) 897-7003 or Terry Dolton, (714) 846-0033.

Green Scene--The Green Party of Orange County will gather Saturday to honor Frank and Fran Robinson with its first Environmental Activist Award for their part in preserving the Upper Newport Bay. The event runs from 2 to 8 p.m. at 2335 N. Park Blvd., Santa Ana. Tickets are $10 in advance or $12 at the door. Information: (714) 644-7835.