Thank you for reaching out.
Please refer to the below parameters for events API call.
This explains the values being returned.
You will also see a similar experience in the sample API response being talked about in the docs.
HTTP/1.1 200 OK
Content-type: application/json
Preference-Applied: outlook.timezone="Pacific Standard Time"
Content-length: 1932
{
"@odata.context":"https://graph.microsoft.com/v1.0/$metadata#users('cd209b0b-3f83-4c35-82d2-d88a61820480')/events(subject,body,bodyPreview,organizer,attendees,start,end,location)",
"value":[
{
"@odata.etag":"W/\"ZlnW4RIAV06KYYwlrfNZvQAAKGWwbw==\"",
"id":"AAMkAGIAAAoZDOFAAA=",
"subject":"Orientation ",
"bodyPreview":"Dana, this is the time you selected for our orientation. Please bring the notes I sent you.",
"body":{
"contentType":"html",
"content":"<html><head></head><body><p>Dana, this is the time you selected for our orientation. Please bring the notes I sent you.</p></body></html>"
},
"start":{
"dateTime":"2017-04-21T10:00:00.0000000",
"timeZone":"Pacific Standard Time"
},
"end":{
"dateTime":"2017-04-21T12:00:00.0000000",
"timeZone":"Pacific Standard Time"
},
"location": {
"displayName": "Assembly Hall",
"locationType": "default",
"uniqueId": "Assembly Hall",
"uniqueIdType": "private"
},
"locations": [
{
"displayName": "Assembly Hall",
"locationType": "default",
"uniqueIdType": "unknown"
}
],
"attendees":[
{
"type":"required",
"status":{
"response":"none",
"time":"0001-01-01T00:00:00Z"
},
"emailAddress":{
"name":"Samantha Booth",
"address":"samanthab@a830edad905084922E17020313.onmicrosoft.com"
}
},
{
"type":"required",
"status":{
"response":"none",
"time":"0001-01-01T00:00:00Z"
},
"emailAddress":{
"name":"Dana Swope",
"address":"danas@a830edad905084922E17020313.onmicrosoft.com"
}
}
],
"organizer":{
"emailAddress":{
"name":"Samantha Booth",
"address":"samanthab@a830edad905084922E17020313.onmicrosoft.com"
}
}
}
]
}
Hope this answers.
Thanks.