LongHouse Reserve in East Hampton will give its “On & Off the Ground III & Open Bowls” exhibition a classical opening Saturday with a Music Festival of the Hamptons concert by the Aeolus Quintet.

The On & Off the Ground invitational brings an array of landscape and garden designers into competition. John Danzer will judge the lineup of imaginative vessels brimming with lovingly selected and arranged plants. Danzer is an exterior decorator and creator of original garden furniture whose work can be seen in public and private gardens worldwide. Past judges have included Martha Stewart and P. Allen Smith. The Open Bowls competition will be for designers of decorative objects distinct enough to stand alone in a garden.

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In addition to the blue-ribbon events, LongHouse will host a concert in the gardens, near Yoko Ono’s "Play It by Trust" piece. The woodwinds ensemble will perform a program including the suite from “Carmen,” selections from “The Sound of Music,” and Scott Joplin’s “Maple Leaf Rag.”

The gardens open at 5:30 p.m. for an exhibition preview, followed by the ribbons presentation and the concert at around 6:30. LongHouse Reserve is located at 133 Hands Creek Rd. Admission $20; longhouse.org, 631-329-3568.