Good evening Fumihiko and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the Facebook imports giving you trouble.
I would love to help you with this topic.
Would you mind sharing the URLs of those groups and pages as well as example of future events that are not being picked up by Event Aggregator ?
Finally, could you give me an idea of how many events you are importing this way ?
You can use a private reply for this purpose 🙂
Hang in there as we figure this out.
Best regards,
Geoff B.