This course management (event management) component allows you to have a complete event listing and booking system on your Joomla! site. Your customers can book an existing seminar or register at a prospect list. The OSG Seminar Manager PRO comes as package with multiple modules and plugins like Upcoming Events, Calendar, Search, Manual Booking and Invoice, Voting of coure topics.....
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Frontend:

• Limit of the bookability of events to specific user groups (access levels for courses and categories)
• publish courses (events) in multiples categories or tags, as list and as course details,
• publish course (event) templates without dates (preview of courses (events) - interested parties list)
• publish an unlimited number of prices
• display of prices can be scheduled, for example, early bird discounts ,which are automatically hidden.
• display of the participant list and waiting list in the frontend
• display of free seats
• support of 2nd currency using a static exchange rate
• display up to 5 price groups depending on Joomla! Usergroups (e.g. prices for members)
• display if a course (event) is already fully booked
• offer documents to download
• list trainer profiles (trainer lists) and the courses of the trainer
• display of more course (event) details (day, time, room, etc)
• and much more..

Users can:
* book multiple seats on events or
* register as interested party to events without date
* pay via Paypal
* registered users can view their invoices in front-end
* registered users can view favorites

Administration:

• All changes to personal data are logged. (A requirement of the GDPR)
• Rebooking of several participants at the same time
• automatic users registration,
• attachment of invoices on booking confirmation emails,
• customize email and invoice templates,
• administrate all users on this list in back-end and notify them on new course (event) dates,
• prices can be displayed with or without VAT,
• sending particpants or groups of participants emails directly from the backend,
• automatic PDF invoice generation
• generate PDF attendee lists,
• create custom fields for the application form,
• clone courses (events) from templates,
• organize course (event) with tags or categories,
• administrate tutors, tutor profiles,
• allow acces to the backend with limited rights (manager and trainer roles)
• and much more

Read more http://feeds.joomla.org/~r/JoomlaExtensions/~3/AM7obsUyowU/osg-seminar-manager-pro