Free Kellogg's Crunchy Nut cereal + fruit juice served in pop-up restaurant, all day Sat+Sun Manchester Arndale
I experienced this unique dining event on Thursday and I loved it - humble cereal is elevated to gourmet status, you are given a menu with a choice of 7 cereals (I chose chocolate cluster one, very nice), are seated, then waiters serve your choice in very posh wide brimmed dishes (think Audrey Hepburn's hat!) along with your choice of 3 fruit juices.
Simply turn up and go straight in/queue, no voucher or anything needed. It's in Exchange Mall atrium (new part) of Manchester Arndale until Sunday and on Thursday it was open the same hours as the shops so would think it'll be the same (don't forget Sunday shopping until 7pm now).