Hm, I wonder if this will work?
# List all the live or past webinars from a specified period of time.
get /metrics/webinars?from=yyyy-mm-dd&to=yyyy-mm-dd&type=...&page_size=...&next_page_token=...
From this other post: Get all meeting and webinars
API reference page:
Update 1
It seems that endpoint can only retrieve webinars within a month’s timeframe. As in, the delta between “from” and “to” querystring parameters can be, at most, a month.
Update 2
Oh, I missed the part where it only lists live or PAST webinars. Nothing in the future. This will not help. I need live or FUTURE webinars.