Yes they do

I think on Wednesday's nights, not sure? Every Dennys has it, but may be different per Dennys rather its fanchised or owned.You may have to call per location to ask.

Denny’s Rewards Members receive a Free Build Your Own Grand Slam® coupon to redeem in-store once during the month of their birthday. Restrictions may apply

Most locations offer delivery. To find the nearest participating location, visit order.dennys.com.

Most locations offer Free Wifi. Contact the Denny’s location for availablity.

Denny’s restaurants are open 365 days a year. Contact the Denny’s location to confirm their hours.

Another year closer to death.

No.. dine in, online ordering, take out

U can order it online too