After 54 years of service, at a “An Intimate Evening Benefiting the Rex Foundation,” Hot Tuna on December 2 put a culminating exclamation point on the compelling electric rock ‘n’ blues performances that the band has been known for. It was Hot Tuna’s final electric concert in California; the final, final electric show was to take place in Denver on Dec. 7. Mesmerizing as an electric or acoustic outfit, acoustic Hot Tuna will continue on in 2024.