NAPA SOUTH    Wednesday night   Joe Grassino live in the bar!! Thursday night.  Cinco de mayo specials. $5 frozen margarita's.  $2 coronas.  $4.95 ..2 chicken or beef tacos. All specials from 4 pm til 10 pm!!!   Don't forget Thursday night is prime rib night at Napa Sonoma!!   MAKE YOUR MOTHERS DAY RESERVATIONS BEFORE WE FILL UP!!              NAPA PLUMGATE       THIS WEDNESDAYS WINE TASTING AT NAPA PLUMGATE WE ARE POURING MOLLY DOOKER SHIRAZ, TAIT "BALL BUSTER" SHIRAZ, EL NECIO SYRAH, AND THE ELYSE SYRAH!!!! ONLY $20!!!   DON'T MISS PRIME RIB THURSDAY!!! $17.95 FOR AN 8OZ AND $23.95 for a 12OZ!!!