Who telephoned jess and what did the caller want in chapter 10 bridge to teribithia?

In Chapter 10 of "Bridge to Terabithia," Jess receives a phone call from Miss Edmunds, his music teacher, who invites him to join her for an impromptu trip to the National Gallery of Art in Washington. The caller wanted Jess to accompany her on the trip and experience the world of art and music outside of their small town.