Chick-fil-A’s 1,600 restaurants better be ready Wednesday for extra business. More than 525,000 people have signed up on Facebook to take part in Wednesday’s Chick-fil-A Appreciation Day, an event that has no official ties to the company. It was launched about 10 days ago by radio host and former presidential candidate Mike Huckabee, who wanted to support the restaurant in light of the pushback it has received after Chick-fil-A President Dan Cathy made comments supporting the biblical definition of marriage.