Since 1971, Mondays at the Metropolitan Museum of Art have been reserved for journalists (attending life-enhancing press previews) and crestfallen tourists. The latter bunch, recognizable by their non-black garments, lack of writing utensils, and general giddiness, mounts the famed staircase in twos and threes only to discover that the museum is…CLOSED. A rapid progression through the five stages of grief follows, and by the time anger (“I told you we should have checked the website!”) turns to acceptance, the out-of-towners are proceeding north to the Guggenheim. That scenario will come to an end on July 1, when the Met’s new schedule takes effect: the museum, both the main building and the Cloisters, will open to the public seven days a week. “Art is a seven-day-a-week passion, and we want the Met to be accessible whenever visitors have the urge to experience this great museum,” said director Thomas Campbell in a statement issued this week.