User is unable to sign up to seminar, they are getting the notification 'Attendance in other events restrict booking this event' - I have turned booking conflicts on, but this was turned off before.
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I've seen this message when the user was booked for previous events in the seminar. So it's not so much booking conflict (=booking for events happening at the same time) but sign-up workflow/condition.
These seminar settings control it: How many times the user can sign-up? and Restrict subsequent sign-ups to. If you de-select all options under Restrict subsequent sign-ups to the users will be able to book for any number of events.