[Plugin: Event Calendar 3] plugin not working, please help

hi.. i want to install Event Calendar plugin By Alex Tingle on my site. but unfortunately that plugin doesnt work:( my site become a mess. can someone here who already use it give me some advice to make it work please. is there any relationship with the name of my category that its all starts with the word event. here is my site https://eventsexpo.net/ please inform me if someone of you want at look my site on a mess version:D i mean after i activated this plugin.

thanks

https://www.ads-software.com/extend/plugins/event-calendar/