The World Championship Interregnum

The timeline I created to document The Botvinnik - Keres Rivalry reminded me of a related timeline I created a few years ago to document the 'Interregnum and the first FIDE World Championship cycle' in the thread FIDE Zonals on the About Chess forum.

• 1945-05 • WWII ends in Europe
  
• 1946-03 • Death of Alekhine
  
• 1946-07 • FIDE Congress, Winterthur, Switzerland
  
• 1946-08 • Groningen WCC qualifier, Botvinnik 1st
  
• 1946-09 • USSR/USA match, Moscow (all 6 WCC invitees present)
  
• 1946-10 • Prague WCC qualifier, Najdorf 1st
  
• 1946-10 • U.S. zonal, New York
  
• 1947-?? • Nordic zonal, Helsingfors
  
• 1947-?? • Canadian zonal, Quebec City
  
• 1947-07 • European zonal, Hilversum
  
• 1947-07 • FIDE Congress, The Hague
  
• 1948-03 • World Championship match tournament (WCC), The Hague/Moscow
  
• 1948-08 • First Interzonal, Saltsjobaden (Stockholm)
  
• 1948-08 • FIDE Congress, Saltsjobaden (Stockholm)
  
• 1949-07 • FIDE Congress, Paris
  
• 1950-05 • Candidates' tournament, Budapest; playoff 1950-07 Moscow
  
• 1950-07 • FIDE Congress, Bellevue (Copenhagen)
  
• 1951-03 • First World Championship match, Botvinnik - Bronstein, Moscow

I see there are still a few '??' to be filled in.