Get a list of Participant IDs from an Event

Get a list of Participant IDs from an Event

I can't get a list of related lead/contact participants on my events. My API call looks like this:

https://crm.zoho.com/crm/private/json/Events/getRecords?authtoken=MY_AUTH_TOKEN&scope=crmapi&newFormat=2&selectColumns=Event Owner,Subject,Description,Participants

I assume there's something wrong with just putting in the "Participants" field. Some of the documentation said you can put in "Contacts/Leads" as a field, which also didn't return any Participant IDs. A little stuck here, would appreciate any help.