Thursday night’s book signing for “Rewilding” (Damiani, $35), a slim but affecting hardcover from the photographer Cass Bird, soon overwhelmed the basement confines of Dashwood Books and turned the cobblestoned Bond Street into a full-out block party. For our newest Fête Accompli, we asked partygoers (including some of the young women above, pictured with Bird) who’ve been in front of her lens what the experience is like.