The clue is in the name. Gibbes Museum of Art has announced a new annual festival devoted to visual art, which wrangles some of their tried-and-true signature events into a weeklong art celebration.  The concept, which was formed during the pandemic pause, has long been percolating at the Gibbes. “We have always been thinking about creating a week in Charleston that’s devoted to the visual arts, something that really encompasses the community,” said Angela Mack, executive director of the Gibbes Museum of Art. Dubbed Art Charleston, the festival this year celebrates creative freedom and takes place May 9-13. Among the host of happenings are four of the museum’s signature events…