To kick off Austin Blues Festival’s Saturday and Sunday expansion at Waterloo Park (doubling the dates for their second year of relaunching the 1999-founded Antone’s Blues Festival), the club headquarters invites shades of blues guitars, guitars, guitars. No longer a teen sensation, Kilgore, Texas, shredder Ally Venable arrives after last year’s home-state-loving Buddy Guy duet “Texas Louisiana.” A Seventies gospel funk innovator as guitarist for the Relatives, Dallas native Gypsy Mitchell keeps his immaculately branded solo revival rolling with latest Paul Wall collab “I’m Still Standing.” Houston guitar phenom Mathias Lattin, who won last year’s International Blues Challenge at 20 years old, completes the next-gen sandwich. – Rachel Rascoe