It’s officially “summertime, summertime, sum-sum-summertime,” and the Mid-Hudson Children’s Museum wants to celebrate with you. During its “Celebrate Summer” program this Friday, June 22 from 10 a.m. to 4 p.m., you and your crew can enjoy arts, crafts, ice cream, tie-dye and more. At 10 a.m. and 2 p.m. you can sing and dance along with the fantastic Dog on Fleas band.