She socialized with the Washington Social club, pulled together The Housemates for several years of DCist’s entertainment — including an Unbuckled performance and a recent interview — and now Olivia Mancini is realigning her musical efforts yet again. She and her new lineup, Olivia and the Terrible Two, are playing a show at the Black Cat this weekend with Tereu Tereu and Revival ($10, 9 p.m.). Here’s what she told us earlier this week about…