Below is a list of typical announcement activities, along with the goals they typically support as well as the tiers of announcement they're usually associated with.
This list is a guide from which to start building your launch plan, not a rule
neither prescriptive nor comprehensive
You should use this list as a starting point, based on the goals of your launch.
The activities are suggestions - every launch should be assessed on an individual basis, taking into account the audience, potential impact, time of year, other features or projects launching around the same time and so on.
This also isn't comprehensive - we should
always think creatively
about new announcement activities and not just follow a 'standard' formula.