The state program to offer free admission to kids and an accompanying adult is aimed at providing learning enrichment this summer.  The Danbury Museum is participating, but asks visitors to book tours online, at least 48 hours in advance for Wednesdays through Saturdays.  The New Milford Historical Society & Museum is also participating, but is open by appointment only. Several organizations that are part of the Connecticut Art Trail are participating in the initiative launched this month to provide students and families with free learning experiences.  Among them is the Aldrich Contemporary Art Museum in Ridgefield.  20 museums and historic sites are part of the Art Trail, launched in 1995, to promote Connecticut’s cultural assets as part of a travel experience.