Book multiple appointments

Is your feature request related to a problem? Please describe.

I want to use NextCloud to handle booking drop-in courses at a community center. I have different types of classes (pottery, dance, drawing, cooking, etc) and each individual class has a different attendance cap. My clients are diverse but include a lot of people with low internet or tech literacy, so this system needs to be straightforward for them.

Describe the solution you'd like

I would like the client-facing appointments booking page to allow people to book all the sessions they want for the next week/month in one step. This means they should be able to toggle on/off multiple slots before clicking a "Book" button where they fill in their name and email. When submitted, should get a single email confirmation that, when confirmed by them, adds them as guests to each of the selected sessions.

But in the simple case where only a single appointment can be booked at a time as it is now, there should be no extra "Book" button.

Describe alternatives you've considered

No response

Additional context

No response

Start by locating the existing client-facing appointment booking flow and how single-session booking currently handles guest details and confirmation. Define the two required outcomes from the issue: multi-session selection with one confirmation, while preserving the current single-appointment flow without an extra Book button.