For a web project the DHTMLX Scheduler .NET control seems to suit the required needs excluding reminders (which is major disadvantage since it means that it will require inhouse programming).
In order to check the integration of product into the project it is required to check its influence from many prespectives on many factors (programming, desgin, loading speed, security) which may take much longer than the specified trial time (30 days). How this problem can be solved? Is it possible to apply for longer duration? Is it possible to reinstall the dll after each expiration?