Writer and actress Katie Rubin, who has become increasingly familiar to local audiences with her comedic solo shows, brings a new piece here for two performances this weekend. Rubin’s observational comedy often deals with modern spirituality, and her new show “Dick So Big” continues to mine that territory. The first performance is 8 p.m. today at Big Idea Theater, Sacramento. 1616 Del Paso Blvd. Sacramento. (916) 960-3036; www.bigideatheatre.com. Tickets are $15 online or $20 at door. At 8 p.m. on Saturday at Rubin takes the show to The Center for the Arts Off Center Stage in Grass Valley, 314 W Main St., Grass Valley. (530) 274-8384, www. thecenterforthearts.org, www.katierubin.com/.