Hello @Victoria Jory
Welcome to the Atlassian community.
Yes, there are a few ways to accomplish this.
First, start by creating a Filter that selects the work items of interest. If they are all of the type "Event", you can start with the filter:
issuetype = "Event"
Since you are on the Premium plan, if you have enough permissions you can create a Plan and use that Filter as a Source.
https://support.atlassian.com/jira-software-cloud/docs/plan-and-view-cross-project-work-with-advanced-roadmaps/
With Plans you can view the events in a Timeline, customizing it to show the timeline based on the start and end date fields you use in the Event items to indicate when the event occurs.
You can Group the items by Space if you choose.
If there is some field that you use to indicate an event is internal vs external, you can add that field to the display.
There is also a Calendar view in Plans, if you prefer that type of view to a timeline.
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