A decathlon is ten event, in order
Day 1
100m
Long Jump
Shot Put
High Jump
400 m
Day 2
110H
Discus
Pole Vault
Javelin
1500m
Read more: What_are_the_olympic_field_events_in_the_decathlon
In the Olympics, there are 17 Track and Field events, plus two relays, two walks for men and the Marathon. There are many other non-Olympic level track and field events, the entire list of imperial distance (yards) events (aside from the mile) was removed from official status where the IAAF (the world wide governing body) decided to no longer keep records. That doesn't mean those are no longer events. So you have to define the list of events you are questioning first.
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