Documentation
Live Broadcast Feature
You can use the live streaming tool (overlay feature) for event broadcasts. It makes it easy to add captions (slot information or banners) to your streaming screen, such as for YouTube Live, using OBS.
Using the Live Streaming Tool (Overlay Feature)
Click on an event from either “Public Events” or “Drafts” on the event page to go to the event management and operations page. (For details, see 「About Event」)
Click on “Live Streaming Tool”.

The live streaming tool displays two types of URLs: the “Controller Page” and the “Overlay Page”. 
① Add the “Controller Page” to OBS's custom dock, and ② add the “Overlay Page” to the browser source.
This allows you to display:
- Event banners on screen (with customizable transparency)
- Animated captions for each slot.

↓For a detailed explanation, please watch the video below starting around the 38:40 mark.