Once LinkedIn opens, press Cmd+V (Mac) or Ctrl+V (Windows).

Your post text will appear in the box. The AWS UG Trivandrum event card with the branded "I'm attending" image shows up below it. Hit Post and you're done.

Preview or edit the post text
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Edit anything you like. When you hit the share button above, whatever's in this box gets copied to your clipboard.

Why two steps?

LinkedIn does not allow apps to pre-fill the post text from a URL link, so a manual paste is the closest one-click we can get. The branded event card on LinkedIn is automatic.