Four Seasons Arts is offering free concert tickets to Berkeley Lab employees for a 3 p.m. performance on Saturday, April 15, at St. John’s Presbyterian Church, in Berkeley. Cellist Thomas Mesa and pianist Ilya Yakushev will perform pieces by J.S. Bach, Andrea Casarrubios, and Kevin Day. Tickets are limited. If interested, please email ccarpenter@fsarts.org or call 510-845-4444.