Don’t forget to go HERE and sign up for the Denny’s Rewards program online. The first 500,000 people who sign up will receive a voucher for a free burger and fries via e-mail to use use 3/1-3/6. It won’t say anything about it when you sign up, but Denny’s is very busy reassuring everyone on their facebook page that if they are one of the first 500,000 they will receive it.