DOVER, Del. - The mayor of Dover says the city will move forward with plans to allow Halloween trick or treating and to host an annual holiday celebration in December.The Delaware State News reports that Mayor Robin Christiansen said he expects participants to wear face masks and social distance during the events with the continuing health threat from the coronavirus pandemic.“One of the reasons I’m probably going against what is expected of us is because kids have been cooped up too long,” Christiansen said. “We’ve canceled so many of our signature, fun events in the city, and parents will be able to take their kids around trick-or-treating.