Yes, there are at least a couple options and depends on which version you are using for Live Streaming with YouTube.
If you are using YouTube Authentication, just point your users to you channel page:
https://www.youtube.com/channel/<your_channel_id>. This page will show them a list of all your streams, including the one you are currently live streaming.
If you are using YouTube Stream Now, and as long as you don't change your Stream Key, you can simply point them to a your latest Stream with this link: