You're welcome to use JEM.
The question is: Do you need old or archived events you posted in the old extension? Normally no!
If yes (because they are actual), you have to find a way to export this and to bring it into a csv which is compatible to the JEM. To find how is build JEM csv file, you can export a JEM file and analyse it.
Because it seems redevent doesn't continue, it doesn't need a plugin!
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".)
If you find JEM useful and if you use it on your site, please consider a donation to the project.
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