There's a very simple display calendar gadget for free if you you are happy to (ab)use issues to represent these events. Should be the first hit on https://marketplace.atlassian.com/search?hosting=cloud&product=jira&query=calendar
There are some paid apps which have more advanced calendar gadgets as well, also on that list. I've not used many of them a lot, but all four with >500 installs seemed good when I've run into them (one of them being the free Atlassian one)
Whilst you can use the default calendar gadget or Jira plugins, the Confluence Teams Calendars are much more flexible and allow you to surface lots of different data types including:
It also does lots of fancy pants bits like enabling subscriptions and making it easy for you to slice and dice event data across different wiki spaces
I'd suggest exploring that first unless there's a compelling reason not to :D
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