Hi Brittany, and thanks for getting in touch!
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In the meantime, I did a quick check and using ampersands in titles seems to work when using the latest version of The Events Calendar (4.2.3) and the default WordPress Twenty Sixteen theme. I would suggest testing for conflicts to find the where the issue is coming from and reach out to the developer of the component that is causing that to happen.
Cheers!
Geoff