JIRA Customization Demo Development

Dear Community,
Our Enterprise would like to see a JIRA deployment demo with some customization.
Our High level requirement is to develop a calendar dashboard (or use existing JIRA Plugin), that shows the different events, their duration, if there is any overlap, etc.
While creating the event, with start date, end date, and the description, the plugin, should check if there is any overlap, in case there is an overlap, it should send a notification to the other overlapping meeting creator/attendees, to gather their approval.

Anyone knows any company willing to support?

Thank you.