Jennifer Elowitch, who helped found the Portland Chamber Music Festival in 1994 and serves as the organization’s artistic director, will step down in August 2018. Elowitch’s planned move was announced Monday in a press release from Alice Kornhauser, the group’s executive director. “By the time I step down, I will have brought my artistic vision to PCMF for 25 years,” Elowitch said in the release.