I checked your sites and this appears to be an issue with the migrated data, and it’s affecting all the content of the website, not just the events. Here’s a screenshot of what I’m seeing when I compare two events.
You’ll also see the same  ‘s on regular WP pages like this one:
In the process of migrating the data was the data changed in a text editor? If so, I’d recommend trying a plugin like WP Migrate DB instead to safely migrate the data.
Some more links that might help explain what’s going on here:
The support post ‘Migration of Site Disrupting Events’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.