While you can go live to your Facebook pages and groups at any time, many publishers on Facebook prefer to use Facebook's Scheduling feature so that their followers have prior notice and are more likely to watch their live event.
Schedule a Live Video on Facebook
Log in to the admin account for your Facebook page and navigate to your page. Select the Publishing Tools tab.
On the left navigation menu, select Video Library.
In the upper right corner of the Video Library, select +Live.
This window will open. Since you are using Mevo, you can disregard the information on this screen and click Next in the lower right corner.
You can configure information about your live video as desired, such as a title and tags. Navigate to the lower right corner and click the dropdown arrow next to Go Live.
Click Schedule Live...
Set a start time for your live video and upload an image if you wish. When you are done, click Schedule.
After a moment, your scheduled Live Video will appear in your Video Library list and indicate that it is scheduled.
Go Live to Your Scheduled Live Post
In Livestream Studio, navigate to the Stream tab, select Facebook and log in to the same account. Select your page under Post As, and then open the Stream To dropdown menu. Your scheduled live video post will appear there.
Select that live event. If you need to stay live for longer than four (4) hours--Facebook's limit--then check Continuous live. Please note that your video on demand will not save onto your page's timeline if you select this option.
Click Advanced Settings to configure further audience settings and select which network to use, if you have multiple available.
When you have finished configuring your settings, click Done.
Give your stream a title and choose a streaming quality. Then click Go Live in the bottom right corner.
When you edit your scheduled post on Facebook, you can see your stream come in and monitor it. However it will not appear live on your timeline until the time you schedule your post to go live.
A countdown will appear on your live post within 3 minutes of your scheduled time.
When the countdown hits zero, your stream will appear in your timeline automatically.