About 60 fourth- and fifth-graders from Harrity Elementary School in Southwest Philadelphia surprised artist Terry Adkins and clamored for his autograph as he stood in front of his work “Ezekiel” (1995) at the Institute of Contemporary Art earlier this month. The students’ visit to his critically acclaimed exhibit, “Relay Hymn,” is one of a series that is bringing public school children into the ICA to see and make art. “Relay Hymn” will be in the upstairs gallery at the ICA until Nov. 7