I have read your project description, and i have checked the demos, and i completely understand what you need. The software website doesn't mention if the software source code is encoded or not, so i assume it's not (please note it's not possible change encoded/encrypted source code). I will need full source code, and or access to your website with installed software via temporary FTP account. Then as last thing sending the emails 1 hour before the meeting requires cron (application for periodically calling scripts at certain time), please make sure your hosting supports this feature (usually does, and it's possible to set it up via control panel, however without this is not possible to implement this feature). I'm looking forward to our cooperation.