Whenever a booking is made 2 emails are triggered for admin and attendee (client) so 4 in total. The first is my workflow email which I want, the 2nd is an email with ics attachment. Can I disable the 2nd one? We already have all the information in the 1st?

That is currently not possible. But I just added a comment to this already closed issue, you can see updates here if we decide on implementing that feature

@Carina Wollendorfer Thank you for letting me know and appreciate that you consider requests that are made. Personally, I think the option to disable default email for both admin/client is a good thing. In my testing the client became confused receiving both default and workflow. If they had a choice they said the workflow as its seemed "more readable". Anyway, thanks.