We aren't sure whether to call them dual shows or dueling shows, but together the annual Dwell on Design and CA Boom exhibitions will give visitors an abundance of contemporary architecture and furniture this weekend. The Dwell event's exhibitors include Hometta, a just-launched service offering architectural plans for what it calls small, sustainable houses designed by more than two dozen firms nationwide. At $1,195 to $3,195, the plans are being marketed as a less costly alternative to architect-designed custom homes. Across town at CA Boom, more than 100 vendors will represent modern parenting, prefab, building finishes and more. Dwell: 10 a.m. to 6 p.m. today, 10 a.m. to 5 p.m. Sunday at the Los Angeles Convention Center, 1201 S. Figueroa St.; tickets start at $25; www.dwellondesign .com. CA Boom: 11 a.m. to 6 p.m. today, 11 a.m. to 5 p.m. Sunday at the former Robinsons-May store, 9900 Wilshire Blvd., Beverly Hills; tickets start at $20; www.caboomshow.com.