It was SRO at Dagny’s for what was by far one of the most remarkable local confluences of improvisational wizardry I’ve ever been a part of, with internationally renowned master drummer Lukas Ligeti stopping in on his way to CalArts to receive the Alpert Award, Brooklyn bassist James Ilgenfritz coming through on a solo tour, and electric bassist Steuart Liebig driving up from Los Angeles because we asked him nicely. The opening set featured local psych cadets the Invisible-Astro-Healing-Rhythm Quartet, with saxophonist Chris Nguyen sitting in…