San Francisco’s pride and Oakland’s joy, Sonny and the Sunsets and Shannon and the Clams, are taking the stage at Great American Music Hall for a New Year’s Eve-Eve amuse bouche. Both groups approach the West Coast garage pop and surf sound with a strong pour of nostalgia for the sweaty 50s and 60s dance parties of yore. And both groups are touring in support of their widely-lauded 2015 releases, Talent Night at the Ashram and Gone by the Dawn.