National Small Business Week kicked off with some star power in Washington, D.C., Monday as entrepreneur and “Shark Tank” host Mark Cuban showed up at a Small Business Administration event honoring small business owners from around the country. Cuban not only gave a 10-minute speech, he also stood on stage for 30 minutes to congratulate Small Business Person of the Year winners from all 50 states. Then, during a break in the program, he posed for selfies with attendees for 10 minutes.