HAMDEN -- The eighth annual Don’s Hat Rack Motorcycle rally and picnic takes place on Sunday, starting at the Louis Astorino Rink on Mix Avenue. Registration starts at 8:30 a.m.  Donations are $25 for the rider and $10 for the passenger. They will leave the rink at 10, with a police escort and ride through New Haven to the Smilow Children’s Hospital. Riders will meet hospital officials and present them with a $10,000 check for the Children’s’ Center.  At that point some of the children from the hospital will visit with the riders and spend some time sitting on the bikes. The ride will end at the Polish American Club on Spring St. in West Haven. A picnic lunch will be provided.  Non riders are welcome to join the picnic. They will accept donations at the gate.