Will most likely stay in Hawaii during its first summer.
As you may have read, the Pacific golden plovers in Hawaii departed that location on April 19-20, 2016. I believe the adult black-bellied plovers also departed that island close to those dates, because I couldn't find that species. Until today!
During a two-hour hike, I discovered a juvenile black-bellied plover (a.k.a. "grey plover" in the rest of the world) in Hilo, Hawaii! Juvenile birds in that species doesn't breed until they're two-years old, and typically remains in their winter grounds during its first summer.
The closest I could get to that bird was 65 feet before it flew into the forest. I'm planning on visiting that site again in a couple weeks to confirm it's a juvenile.