Refactor packages: review `AnnounceEvent` struct #2689

Job	Run time
Formatting	21s
Build on ubuntu-latest (nightly)	3m 22s
Build on ubuntu-latest (stable)	3m 32s
Build on macos-latest (nightly)	4m 55s
Build on macos-latest (stable)	3m 11s
Build on windows-latest (nightly)	6m 47s
Build on windows-latest (stable)	7m 2s
Static Analysis (nightly)	2m 10s
Static Analysis (stable)	2m 2s
Units (nightly)	14m 45s
Units (stable)	13m 19s
E2E (nightly)	20m 1s
E2E (stable)	21m 12s
	1h 42m 39s

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