I have some customization in my website

I have some customization in my website using Listeo Theme. You have to implement date picker with plugin and then check date event data is exist in database on the selected date. The developer of listeo say that listeo Is prepared to be trasformed in app with a plugin, Fluxstore listing That i have already bought , The app may be a webapp with same functions of the site For users and for owners. fixed Budget 30-40 euro.