Forgotten anniversaries

2017 is the 100th anniversary of the Russian revolution. Other anniversaries:
50 years Radio 1; first North Sea gas pumped ashore in County Durham; first cash dispenser (at Barclays in Enfield)
100 years First international airmail service (between Brindisi in Italy and Valona, Albania); first use of air raid siren in UK; first sex education film (in the US)
200 years First municipal gasworks, Manchester; Fahrenheit scale; display of Elgin marbles at the British Museum
300 years First druid-revival ceremony, at Primrose Hill at the autumn equinox
400 years Britain’s first one-way street (Pudding Lane, in the City of London)

Things to crow about

Some things...