I WISH I COULD walk every visitor around personally at Garden Conservancy Open Days—and answer every question. But that’s impossible when hundreds of guests stream through for the self-guided walkabouts I’ve been hosting for 20 years (last one of 2017 is on August 19, top of page).Many visitors have asked me to take it to the next level. Now Andrew Brand of Broken Arrow Nursery—they always do plant sales at my big Open Days—and I are offering a sort of “Open Day-Plus” on September 16: smaller, ticketed, workshop-style events and sales lasting a half-day each, with lots of individual attention.Space is limited, at each of two sessions per day.Ticket includes $25 Broken Arrow shopping credit.The September program (from 9:30-noon, and repeated from 1:30-4 PM):Baked Treats & Beverages: Fuel up, get acquainted, and te