I use the eventbutton plugin from earlier JEM3 on JEM 2.2 with Joomla 3.6.5 and php 7.1.
I can choose in FE events which are then linked in an article.
Even when it works, I get some error notifications in the modal window.
on JEM 2.3.3 stable in latest Joomla (3.10.2) Protostar php7.4.15
Personally I use t4_B5 template with t4_system plugin framework with bootstrap 5 and fontawesome)
(I prefer free "Signal" or paid "Threema" instead of "Whatsapp".)
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