Search Box for Web Page

Hi

I have a website https://www.stayevents.co.uk that I had built from a developer on word press but need a search box added to the following page so users can search for specific events when they are on. The page can be found at: https://stayevents.co.uk/events-calendar/

I’m not making enough money yet to keep paying huge labour costs for my developers to do this so was wondering if anyone could help me as many people tell me I can do it myself but don’t want to make a mistake.

Any help would be greatly appreciated.

Thannks

Edward