The questions
1 What is celebrated, mathematically, on 14 March and 22 July?
2 Which form of Chinese originated in Guangzhou?
3 Summoner’s Rift is the main battleground in what game?
4 What is advertised as “Scotland’s other national drink”?
5 Which archipelago is home to Norway’s polar bears?
6 Which activist was arrested in Rochester, NY, in 1872 for voting?
7 What was the first martial art to become an Olympic sport?
8 Which organ produces insulin?
What links:
9 Dominic McLaughlin; Jamie Parker; Daniel Radcliffe?
10 Riviera’s second city; goddess of victory; Bill Bowerman and Phil Knight?
11 Star patterns; time travel in Hill Valley; piano; neo-Nazi code?
12 Lime Rickey; Arnold Palmer; Shirley Temple; Virgin Mary?
13 Political Wife (Sarah Vine); Politician (Rory Stewart) Professional Footballer (Paul Merson); Boy (Robert Webb)?
14 Ghost; Lordi; Pussy Riot; Sleep Token; Slipknot?
15 Ancelotti; Enrique; Guardiola; Happel; Heynckes; Hitzfeld; Mourinho?