Thanks to Who Said Nothing in Life is Free???? for the following info:
Denny’s will provide free refills to any order of French fries or pancakes at participating locations nationwide. In addition to the Free Original Grand Slam® giveaway and the sweepstakes, Denny’s is distinguishing itself from its competitors with a limited time generous offer starting February 10th that takes refills beyond beverages and gives more everyday value to customers.
You can read other promotions they will be offering HERE