As we reported on Monday, Dave Schools and Jerry Joseph will be opening a Keller Williams show at the Fillmore in Denver on April 8. However, this will not be a solo Williams gig as the guitarist will expand his roster of one and focus the repertoire on the music of the Grateful Dead. Grateful Grass also will feature Yonder Mountain String Bands Jeff Austin and The String Cheese Incidents Keith Moseley. They will interpret the music of the Dead bluegrass-style, with some additional players quite possibly joining in as well.