The Speaker can be added as a menu on the event landing page if one of the theme is selected. Under Event Setup/See More features, there is an option named "Speaker". Using this, Speaker can be added. Once the speaker detail is added here, the Speaker will be automatically added as a Menu on the event landing page for the default theme and the details of Speaker will be available on the event landing page.
In case of Themes, you need to go to Appearance/Edit Theme. Then Click on Body, you will see Speaker menu. Click on it and you will see an option to enable the Speaker module for the event landing page
Now to add this as a Menu, please go to Navigation under Header and then click on "Add" to add the Speaker menu from the drop-down.