How to disable the email notification only for 2 group activities?

Hello, thanks for your great plugin.
We would need to solve the following issue. In case of “All emails” in groups, how can we remove the email notification only for 2 kind of group activity?
This refers to the email situation “A member created a group activity entry”, so we need to keep all email notifications apart from for 2 specific group activities: 1) When a new user joins the group 2) When a user books an event (ie. he is attending it), it is linked to events manager pro.
We would really appreciate your support. Best regards