MidAtlantic Bonsai Societies Spring Festival Set for Harrisburg, April 2026

When Peter Warren graduated from his six-year apprenticeship under Kunio Kobayashi at Tokyo's Shunkaen Bonsai Museum in 2009, he joined a very short list of Western artists to have completed a full classical Japanese training at that level. On April 17, he arrives at the Holiday Inn Harrisburg-Hershey in Grantville, Pennsylvania, alongside California-based artist Jonas Dupuich and American-born, Japan-based Kaya Mooney for the MidAtlantic Bonsai Societies Spring Festival. Three demonstrators from three distinct bonsai traditions, one regional ballroom.

The festival runs April 17 through 19 at 604 Station Road, opening Friday evening and continuing through Sunday afternoon. Organized by the MidAtlantic Bonsai Societies (MABS), a 501(c)(3) nonprofit representing member clubs across the region, the gathering functions simultaneously as a lecture series, hands-on studio, judged exhibit, and regional marketplace. Few single-weekend events on the East Coast compress that range of programming into the same building.

The headliner roster makes the 2026 edition notable even by national standards. Warren built his post-Shunkaen career working with collectors across multiple continents from a studio on the outskirts of London, bringing a classical Japanese grounding to European and British material. Dupuich runs a Northern California nursery, authors the Bonsai Tonight blog, wrote "The Little Book of Bonsai," and co-founded the Pacific Bonsai Expo: his reputation rests on translating advanced technique for a wide audience without flattening its complexity. Mooney, an American currently living and working in Japan, occupies the genuinely rare position of a practitioner shaped by direct immersion in contemporary Japanese bonsai culture who can speak fluently to a Western audience.

For intermediate practitioners, the critique sessions are the weekend's most concrete opportunity. MABS structures these as interactive group settings where all three guest artists deliver direct feedback on participant trees, offering the kind of evaluative attention that is otherwise accessible only through private instruction or national-level exhibition. A critique from Warren, Dupuich, or Mooney on a developing collected specimen or a borderline shohin can clarify months of directional uncertainty in a single conversation.

The demonstration format pairs well with an incentive structure: eight trees will be raffled over the course of the weekend, one at the close of each completed demonstration. That pacing keeps attendance anchored to the demonstration blocks while giving every registrant a tangible stake in each session. Hands-on workshops are available in three tree selections, and breakout sessions allow informal access to the artists between scheduled programming.

The MABS member clubs' Bonsai Exhibit runs parallel to the live demonstrations, giving member clubs a regional platform for their best material and providing the full range of attendees with reference points against the artists' work. On the vendor side, Kifu Bonsai, the studio of Japanese-trained artist Robert Mahler, will be among the sellers on the floor. The vendor floor at a MABS event typically covers bonsai and pre-bonsai stock, containers, tools, substrates, and books at a sourcing depth no individual club sale can match.

Mid-April sits in a precise window on the East Coast calendar: spring repotting is wrapping up, summer workshop schedules are not yet locked, and deciduous material is just breaking bud. MABS has long understood that timing. With Warren, Dupuich, and Mooney sharing the demonstration floor, the 2026 festival arrives in Grantville with a lineup that rewards the drive from anywhere in the region.