If you can figure out which part of your theme is producing that heading you could potentially add some code to change it appropriately (not being familiar with your theme, though, means that this is something we’d largely need to leave you to figure out).
We certainly have a range of functions that can be used independently – or combined – to aid with detecting if you are on an events page/which events page you are on. Those might be useful here:
Sorry we can’t do more on this occasion – and good luck 🙂