This weekend, order your eggs sunny-side up. DO Crimson Lounge What: Hotel Sax Chicago’s new nightspot flaunts gourmet small plates and resident DJ Samantha Ronson. Why: You hate to LiLo. When: Grand opening, Fri. Daily, 4 p.m.-2 a.m. Where: 333 N. Dearborn St., b/t Kinzie St. & Wacker Dr. (312-923-2453). Dirty Dog Wash What: Pup scrubs raise money for dog-friendly areas in the South Loop. Why: Sit. Stay. Donate. When: Sat., 10 a.m.-1 p.m. Where: Fountain Square, 600 S. Dearborn St., at Harrison St. (312-264-5630). COMPETE Windy City Cornhole Classic What: Bean bag tourney gets teams competing for the Championship Cup. Why: Sack attack. When: Sat. Registration, 10 a.m.-noon; tournament, noon. Where: Soldier Field’s South Parking Lot, at Lake Shore & Waldron Drs. Register on-site or online at active.com. Info at 773-718-1444. SHOP 23rd Annual Newberry Library Book Fair What: More than 100,000 books, many priced under $2. Why: Follow the reader. When: Thurs. & Fri., noon-8 p.m.; Sat. & Sun., 10 a.m.-6 p.m. Where: 60 W. Walton St., b/t Clark & Dearborn Sts. (312-255-3510). SEE Xefirotarch What: Exhibit of L.A.-based architectural design firm’s digital- and baroque-influenced projects. Why: X marks the spot. When: Thru Oct. 28. Mon.-Wed., 10:30 a.m.-5 p.m.; Thurs. & Fri., 10:30 a.m.-9 p.m. (free admission after 5 p.m.); Sat. & Sun., 10 a.m.-5 p.m. Where: The Art Institute of Chicago, 111 S. Michigan Ave., at Monroe Dr. (312-443-3600).