[The Events Calendar] Plugin Customisation Request

I am working on a project where I need a good WordPress plugin called “The Events Calendar” to be customised to the client’s needs.

For the moment, this plugin provides with a very good events list (or calendar) and handles categories. So we can view the events on the calendar by date, or by category.

But for the client (organising a week of events all over Ireland), the events need to be filtered by:
COUNTY, CATEGORY and DATE.

County (Province), Date and Category are already in the database and all, so I was wondering how much it would cost to add some filters to it? (Drop down or lists)

– On the homepage, the visitors get to choose a County, or a Group Age, or a Date.
– On the County page (for example) they get 3 drop down lists on top of the full list of event. The first one has the County selected. The second one has the date and the third one the Group Age.
– This means they can filter with one, two, or three filters and the list updates or display “Sorry, no events for these criterias”

Same goes if they choose date first, or Age Group first…

Thank you!