The field strength page lists the events that are included for each season, along with the data source for each event. If you see an event not listed that has scores (end-by-end) available on-line, feel free to drop me a line.
I’ve also listed the field strength and number of teams in each event. For now, the field strength calculation is pretty simple. It takes an average of the X highest-rated teams in each event, where X is
8 for events with at least 16 teams
half the number of teams for events with between 3 and 16 teams
both teams in the case of a two-team event