Good evening Wayne and welcome back!
Thank you for reaching out to us.
I would love to help you with this topic.
If you are using SiteGround as a hosting company, I have personally found their built-in SG cache to be quite impressive (results are as good as WP Rocket in my experience). The only downside is that you have less control over what it does specifically.
Other than that, I have use the exact the Events Calendar Pro + WP Rocket + Siteground combination very easily.
You just need to make sure you test everything if you are using some of the Javascript AND CSS related settings (in fact WP Rocket advises you to do just that).
Let me know how that goes.
Best regards,
Geoff B.