Anyone even slightly familiar with Jack White and his Third Man Records likely knows of the iconic impresario’s obsession with the number three — hell, it’s right there in the name of his record label. Thus the impetus for the folks behind the annual fan-curated event Nobody’s Vault but Mine making this, their third installment, their final one ever. Conceived and organized online via a handful of Third Man fan forums, Nobody’s Vault but Mine is primarily a way for Third Man enthusiasts from all over to meet in person, and it features performances from fan favorites — most of them at least loosely affiliated with TMR in one way or another. Saturday night’s lineup will feature legendary former Flat Duo Jet — and one of Jack White’s clear primary influences — Dex Romweber with his sister Sara; garage-goth Third Man recording artists The Black Belles; Jeff Zentner and Elin Palmer; and Jane Rose and the Deadend Boys. On Sunday, there will be performances from Scene faves and brainy Saddle Creek punksters PUJOL; longtime garage rocker, former Greenhorne and current Dr. John sideman Brian Olive; local rag-tag, loud-as-shit rock ’n’ rollers The Ultras S/C (featuring TMR’s own Ben Swank on drums); and Boogaloosa Prayer. Even if you’re not a Third Man devotee, that’s a solid pair of bills.