This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.The O.C. Fair in Costa Mesa is set to open Friday at 12 p.m. and run through Aug. 11. The fair will feature a variety of rides, shows and food stands. General admission tickets run for $12-14 for adults and $7 for children under 12.