It’s wasn’t a beautiful spring day, but that didn’t stop Gov. John Baldacci from participating in an annual event that serves as a harbinger of spring. Baldacci was joined on a rainy Wednesday by Lyle Merrifield, president of the Maine Maple Producers Association, as he tapped a maple tree on the lawn of the Blaine House.Maine Maple Sunday is fast approaching. The event, scheduledeach year for the fourth Sunday of March, will be held on March 22. Baldacci noted that maple syrup is a multi-million dollar industry with licensed producers creating 215,000 gallons of syrup last year.