Refactor Event API to reflect spec changes #3370

Job	Run time
build-graal	5m 11s
Build (macos-latest, 8)	15m 54s
Build (macos-latest, 11)	18m 26s
Build (macos-latest, 17)	19m 15s
Build (macos-latest, 20)	16m 52s
Build (ubuntu-latest, 8)	9m 32s
Build (ubuntu-latest, 11)	9m 51s
Build (ubuntu-latest, 17)	10m 15s
Build (ubuntu-latest, 20)	9m 38s
Build (ubuntu-20.04, 17, true)	10m 41s
markdown-link-check / markdown-link-check	36s
misspell-check / misspell-check	4s
required-status-check	1s
publish-snapshots (skipped)	5s
	2h 6m 21s

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