Hasanni was reported missing by his foster father, 38-year-old Louis Ross, who said the boy disappeared Aug. 10 from a car parked outside a shoe store in Oakland's Rockridge neighborhood.
Oakland police have said they are treating Hasanni's disappearance as a homicide investigation. Police in August arrested Ross and 30-year-old Jennifer Campbell, Hasanni's aunt and foster mother, in connection with the case, but the district attorney declined to file charges because of insufficient evidence.
San Leandro business owner Sherri Miller has been organizing searches, vigils and fundraisers for Hasanni.
She said Saturday's volunteers plan to go to four or five locations, including the Fremont neighborhood where Hasanni lived with his foster family and the Walmart where the boy was last seen in public. "We're not necessarily going through the trenches digging and looking for him," Miller said. "We want to get back out there and tell people he's still missing. He's been forgotten for whatever reason, but he has a biological family that misses him and wants him to come home."
Although it's been more than four months since Hasanni disappeared, Miller said volunteer interest is still strong in Fremont.
The boy's foster parents have stopped attending events and are no longer speaking to the media, Miller said, but his grandmother and a different aunt are involved in all of the efforts.
"In whatever capacity, he deserves to be found," Miller said. "That's what's so hard for me."
Volunteers plan to meet at 8 a.m. Saturday at the Caltrans carpool parking lot near the Newark Boulevard/Ardenwood Boulevard exit off state Highway 84.
Participants can sign up by e-mailing firstname.lastname@example.org or calling Miller at (510) 276-9090. They are also welcome to just show up.
The group is also collecting toys for two needy families, including relatives of Hasanni, Miller said. Coffee and doughnuts will be provided.
Anyone with information about Hasanni is urged to call the Oakland Police Department at (510) 777-3211 or (510) 238-7934 or Crime Stoppers at (510) 777-8572.
A $75,000 reward is being offered for information about Hasanni's disappearance.