The 'Let us loop you in' event being prepared by Apple is scheduled to begin at 7 pm (Greece time) today, Monday, March 21, at the company's headquarters (Cupertino). 
What everyone is waiting for is to see CEO Tim Cook introduce the iPhone SE, the new iPad Pro with a 9.7-inch screen, iOS 9.3 and new bands for the Apple Watch.
I should mention that while writing about today's product launch event, especially in the sentence above, I thought that today's Apple has nothing to do with Jobs' Apple.
The products are not innovative, but rather downgrades or upgrades of products we already know. The presentation of the new iOS will be interesting, but again it is an expected evolution of the company's mobile operating system.
As for the new Apple Watch bands, I prefer not to comment on them.
However, if you still want to watch the event, you can do so from Apple's official website (the link is at the end of the post).
How can you connect?
With Mac: You can watch using Safari 6.0.5 and OS X 10.8.5 and above.
With iPhone / iPad: With iOS 7 or later with Safari.
Apple TV: If you have a 3rd generation device with 6.2 or 4th generation software, you can follow the event from your living room.
PC: With Microsoft Edge for Windows 10.
As is usually the case with Apple events, Android and Linux users cannot watch them from their devices.
https://www.apple.com/apple-events/march-2016/
