Valentine’s Day is today, and The Stonehouse in Nevada City is brewing up just the right thing for a romantic evening with Synthetic Unlimited. “The Lover’s Ball” is a love-themed variety show featuring poetry, seductive Shakespeare, stand-up comedy, a burlesque show and even a bit of puppetry. Music by live swing band, Cousin Cricket, will set the mood, joined by anticipated performances by local swing dancers. Doors open at 7, with music at 8 p.m. A community hub for performers, artists and creative savants of all types, Synthetic Unlimited tends to attract a number of younger performers, which has kept …