Yes, absolutely. You can buy a ticket and gift it to someone else to watch.
The buyer just needs to forward the ticket, they would have received in the registered email address that they would have entered during checkout, to the viewer. As simple as that.
Viewer does not need to log in to watch the event. They only have to click on the Join Event button on the ticket sent to them, to watch the event.
Please note: If the event is enabled for single stream access only per ticket, the buyer and viewer cannot watch the show simultaneously.