When artist Margot Datz begins a new project she finds it hard to stop. “Until someone rips me off the wall I’m there,” she said on Wednesday morning at the Old Whaling Church in Edgartown. Although no one is coming to rip Ms. Datz off the wall, her brother Stephen Datz is on hand to “help her out the door,” he said. Good thing, too, as this weekend there will be a wedding held at the church. Scaffolding and bridal gowns do not really mix. But magnificently-restored murals serving as a backdrop for wedded bliss definitely do.