Original Gravity kicks off its fourth season on Oct. 12, when Exhibit ‘A’ Brewing Company debuts a beer inspired by an all-Steven Snowden program performed by percussionist Matt Sharrock and clarinetist Amy Advocat at its Framingham headquarters. There’s an encore performance on Oct. 19 in Everett when the concert series challenges its first distillery, Short Path, to get in the spirit by mixing up a cocktail that nods to the same tunes.