In a fit of end-of-the-millennium downsizing — or perhaps as an antidote to Saturday Night Fever — producers are staging a rich buffet of one-person shows. Already playing Off Broadway to stellar reviews and whopping ticket sales is The Vagina Monologues (TC), in which Eve Ensler speaks hilariously and eloquently on the titular subject. Mark Linn-Baker (Perfect Strangers) is also starring Off Broadway in Lee Blessing’s one-man play Chesapeake (212-246-4422), as an artist doing battle with a right-wing politician (ring any bells?). And Britain’s favorite cross-dresser is cracking wise in the one-person Broadway spectacle Dame Edna: The Royal Tour (TC). Coming soon to Manhattan’s Lincoln Center: monologuist Spalding Gray’s account of a day in the life of his family, Morning, Noon and Night (performances begin Oct. 31; TC). In Off Broadway’s Another American: Asking & Telling (Dec. 7; 212-279-4200), writer-performer Marc Wolf reenacts his interviews with enlisted men and women about gays in the military. Based on real-life experiences taking reservations for an impossibly hip restaurant, Fully Committed (212-353-3366) stars Mark Setlock as the beleaguered reservationist as well as the callers (including Naomi Campbell’s desperate assistant). Meanwhile, the Seattle Repertory Theatre will be harboring Aliens In America (Nov. 29; 206-443-2222), in which Sandra Tsing Loh recalls life in a German-Chinese household. And last but hardly least, pioneer Lily Tomlin is reviving The Search for Signs of Intelligent Life in the Universe (tickets available locally) on a national tour. And that’s the truth.