One unfabricated fact about the game didn't seem right: that the main negotiations between Fischer and Karpov occurred in the Philippines. The one reference by Chessbase -- Russians vs. Fischer, by Plisetsky and Voronkov (1994), p.366-367 -- mentions only meetings in Tokyo and Cordoba. Then I turned to Kasparov's volume on Fischer, My Great Predecessors IV, where starting on p.467, there is a long, detailed account titled 'Abdication'. Here is a timeline derived from that account.
|1972-09||||Reykjavik: Fischer wins title from Spassky|
|1972||||San Antonio: Fischer visits tournament; meets Karpov for first time|
|1973||||Manila: Fischer visits tournament; meets Marcos, Campomanes|
|1973-09||||Helsinki: FIDE Congress, Fred Cramer presents Fischer's proposals|
|1974-06||||Nice: FIDE Congress; Fischer resigns title|
|1974-11||||Moscow: Karpov beats Korchnoi in Candidates final|
|1975-01||||Philippines offers $5.000.000 for match|
|1975-03||||Bergen-aan-Zee, Holland: Extraordinary FIDE Congress|
|1975-04||||Euwe declares Karpov World Champion|
|1974(?)||||Campomanes takes role of intermediary between Fischer & Karpov|
|1976-07||||Tokyo: First negotiations|
|1976-08||||Cordoba: Next meeting|
|1977-10||||Washington: (1) restaurant, (2) Philippine embassy|
There are some gaps in that table, especially months and venues, which I'll fill in from other accounts.