Click the Actions button on the Live Shows page-->click the Share This Show button, or click the Share button in the live room to post to Facebook, Twitter and Linkedin as well as to get a link you can share anywhere.
When your live stream begins, Podbean will send a notification to your podcast followers. Encourage your fans to follow you in Podbean so they receive notifications and can keep up with your shows.
Make sure to announce upcoming live shows in your podcast episodes, newsletters, etc.
Feel free to get creative to spread the word and build excitement about your live shows by cross promotion and other means too. Make sure to create a catchy title and description. Consider asking listeners for feedback and maybe even for help in sharing the Live Stream link with a friend or on social media.