Only press and a small number of invited guests will attend in person, having received their invitations late last month.
But, everyone else can follow the event live on Apple's dedicated events page.
The stream will also be available on Apple's official YouTube channel for anyone who prefers to watch there instead.
No sign-up or subscription is required to watch either stream, and both will carry the full presentation as it happens.
What to expect once it starts
The event is expected to run through Apple's full autumn lineup, starting with the widely anticipated iPhone Ultra, the company's first foldable device.
Apple typically follows a consistent format for these events, moving through each new product in turn with video demonstrations and on-stage segments.
This year's presentation will also mark a notable shift, since it is the first Apple keynote led by new chief executive John Ternus rather than Tim Cook.
No ticket, no problem
For anyone unable to watch live, Apple usually posts a full recording of the event on its website and YouTube channel shortly after it ends.
Given the scale of tonight's expected announcements, from a foldable iPhone to a leadership change on stage, the recording is likely to be widely shared and discussed in the hours that follow for anyone who misses the original broadcast.
