Graph API similar to Exchange API for controlling notifications regarding updated events

We have the same exact issue, with a different use case, we have tens of thousands of students with calendars we want to automate, but we don't want to send an email invite for each event, of which there are hundreds per student (millions of events total).

• Can't use repeating events to reduce emails because event repeating cycle isn't predictable.
• Can't use shared calendars because Teams doesn't support them and we want students to use a central tool to view their timetables and schedules.
• Can't use webinars to add people because there's no way to add people to a webinar at all (other than emailling a link to self registration, can't do this 6 million times twice a year and expect students to click through 100s of emails to register).
• Can't use town halls which do let us add people because a) can't add people without sending an invite (if emails are disabled then no calendar entry is created), and b) town halls are not interactive like webinars.
• Can't impersonate users to script accepting invites (doesn't work via app or delegated permissions), or automate registration to events (requires users to authenticate and provide a token, which we can't expect them to want to do).

We've spent weeks investigating, planning and prototyping different ways to try and create calendar events without inviting users - which as the attendees all belong to the organisation I don't see any issues with the usual concerns around what it means to be updating calendars on people's behalf - they are our students and they want their calendars to be updated by us by definition of being a student here.

Our workaround has been to create separate events for students with them as organisers (organisers don't get emails) - our middleware syncs updates from the real organiser (teacher / timetabling teams), and because we need an online meeting to be shared among all events, and the meeting records are read only on an event, the joinUrl is deprecated and doesn't appear in teams UI, we have to put the meeting in the event body, which isn't ideal because this bypasses built-in teams features, like viewing the join link in calendars, seeing other attendees in the invites list etc.

What would work for us to be able to provide the ideal solution to our students would be:

• A new type of virtual event for lectures or classes, which is exactly the same as a webinar except student attendees can be added via the API, so the event appears in their calendar but they don't get an email invite or update - the event is just there.
• An optional flag added to the any graph API payload to suppress any follow-on email notifications for that request cycle - so whether we're creating events via calendar events APIs, teams meetings APIs, virtual events etc, we as the organisation can choose not to send notifications to our users when performing bulk updates.
• Or, add Application-level permissions support to the endpoints for registering to webinars, with added ability for the application to register on behalf of a user, in a way which doesn't require an email to be received by the user.