Mad Horse Theatre Company presents the Maine premiere of Grey Gardens: The Musical, a funny yet heartfelt play based on the Maysles brothers’ 1975 documentary about Jackie Kennedy’s eccentric aunt and cousin, at the Mad Horse Theatre in Hutchins School (24 Mosher Rd., South Portland), Thurs. through Sat. nights at 7:30 p.m., Sun. at 2 p.m. Tix: $20 ($15 students and seniors). 747-4148. madhorse.com.