You can try the JEM settings "Events" in the right side there are "venues". You can hide it.
If this doesn't work, then you can go to the file (better to make it in template overrides).
or you can try to hide it with css in media/com_jem....
on JEM 2.3.0 stable in latest Joomla (3.9.22) Protostar php7.4.5
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