Editor’s Note: Erin Zimmer, DCist Staff writer, is a senior at Georgetown. Last night, she took part in the festivities following Georgetown’s Elite Eight victory over UNC. The following is an account of the proceedings. For all of last night’s game, Georgetown townhouses kept their doors open. Crowds of kids huddled around their televisions, jumping up and down at every play. But once the magical three-pointer tied up the game (81-81) with 24 seconds left…