From a decade owning his East Providence restaurant Avenue N American Kitchen, Nick Rabar knew what kind of crowd and sales he d have on any given day. He could look back and know what to expect on holidays such New Year s Day or even any day of the week. Then, this sneaks in, he said, adding, Every day is unique. This is the COVID-19 pandemic that has upended every aspect of business, and llfe. He said it exposed the fragility of both. The greatest challenge is not knowing what s coming tomorrow, said Rabar, who also owns Avenue N Providence and the Pantry at Avenue N, with wife Tracy Rabar.