is denny's open christmas day

That's a good question. I know that some restaurants are open on Christmas Day, but it really depends on the location. In some places, restaurants may be closed or have limited hours, while others may be open and serving meals as usual. It's best to check with your local Denny's or any other restaurant you plan to visit to see what their holiday hours are. Some places may have special holiday menus or deals, so you may want to call ahead or check online to see what's available.