A pandemic is a curious time to open a “bucket list” restaurant — a place where diners splurge to celebrate special occasions, the kind of venue that lures culinary tourists who book reservations months in advance. But as the world copes with the novel coronavirus, chef and co-owner Curtis Duffy and co-owner Michael Muser will don their black masks and welcome customers Tuesday night to Ever, their new $5 million restaurant in Chicago’s Fulton Market neighborhood.

“This is a place