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The Orchestra of Crafty Guitarists sprung from Guitar Craft classes and workshops that Robert Fripp first developed nearly 30 years ago. Guitar Craft workshops begat the performance ensemble League of Crafty Guitarists and ongoing Guitar Circles, which now exist around North America, Latin America, and Europe. In 2009, the Orchestra of Crafty Guitarists — a really big guitar circle, if you will — went public with a performance in Spain. This week, the seventh iteration of Orchestra of Crafty Guitarists performs three concerts in the Northeast, starting Friday at the First Church in Cambridge. Fripp and his band of guitarists then head to Wesley United Methodist Church in Hadley on Saturday and conclude the tour at St. Mark’s Church in the Bowery in New York on Sunday.