Southern German educational institution seeks industry solution (project-related)

I am looking for an industry solution (project-based) for a recognized educational institution and certified provider of qualified training and continuing education for managers and project managers. The search is specifically for the management of its seminars and courses and for its company in general. The events are each to be viewed as a project. We serve both B2B and B2C customers in open events as well as through in-house (company) training courses.

The software should meet the following requirements:

• Seminar management (project)
• Course management (project)
• Participant management
• Preferably as a customer database where conversation histories can also be stored
• Additional customer information
• Notes
• Lecturer management
• Reporting, certificates
• Resource management (rooms, external lecturers)
• Invoicing
• Document management
• Appointments, appointment calendar
• Calendar functions
• Filing
• DATEV interface
• Web-based

Four to 15 software workstations are planned. The system will run on MS Windows and macOS.