In 'Stranger Things', in which decade is the series set?

In 'Game of Thrones', which infamous wedding kills Robb Stark? In 'Stranger Things', what is the name of the mall in Season 3? In 'Stranger Things', which character is kidnapped by the Demogorgon in Season 1? In 'Stranger Things', which actor plays police chief Jim Hopper? In 'The Walking Dead', which crossbow-wielding character became a fan favorite? In 'The Walking Dead', what weapon does Negan carry, named Lucille? In 'The Walking Dead', which character wields a katana? In 'Lost', what are the numbers that recur throughout the series?