Yes most certainly.
The exact web address for your event will be setup ahead of time so that your coordinators are able to conduct a full test with the actual playback laptop and network. A sample video will also placed on the same page so that viewers are able to test video streaming connectivity at their convenience anytime(Video on demand). Live streaming and video on demand(VOD) playback of video uses the same streaming mechanism and if viewers are able to play a VOD stream, they will be able to play back a live streaming video.
Having the actual link ahead of time also allows your viewers or event coordinators, who have to setup for the live webcast playback, an opportunity to familiarize themselves with the process and requirements needed to be able to function flawlessly on the actual day of the event.