It's at the Scottish Rite Center on Camino del Rio (Mission/Fashion valley?) - all this weekend. Weekend pass is $10, day pass is $7. If you go to the SDCOS webpage and follow the link you can get $1 off.
And yeah, that Cattleya tree is even better looking in person. I might go stare at it some more today after neeming the new plants...and I'm switching out the bushes in the front (Hibiscus instead of some ugly spider/bee attractor that produces inedible blue berries).