Local chamber music project Twin Forks Musicivic is participating in “Musicast WinterFest,” an annual classical music showcase by several groups that premieres December 18-20, with on-demand streaming available through 2020. Some of this year’s performers are harpsichord and cello duo Warner & Itzkoff, the all-female Cramer Quartet and trumpeter-led Zachary Silberschlag Family & Friends.