AUTHOR VISITS Books & Company: Betsy Carter "We Were Strangers Once," 7 p.m. Sept. 27, Poets for Change open mic night, 7-9 p.m. Sept. 30, Whitman Park Shopping Center, 1039 Summit Ave., Oconomowoc, (262) 567-0106. Boswell Books: Katherine Rundell "The Explorer," 6:30 p.m. Sept. 25, Kathie Giorgio "In Grace's Time," 7 p.m....