您要从事件中检索文件ID.如果我的理解是正确的，那么该示例脚本怎么样?

You want to retrieve file IDs from an event. If my understanding is correct, how about this sample script?

var inStorePartiesCalendarID = "### calendar ID ###";
var eventId = "### Event ID ###";
var res = Calendar.Events.get(inStorePartiesCalendarID, eventId, {fields: "attachments/fileId"});
var fileIds = res.attachments.map(function(e){return e.fileId});
Logger.log(fileIds)

注意:

• 此示例脚本假定您已经知道事件ID.如果需要用于检索事件ID的方法.请告诉我.
• 如果要检索附件文件的文件ID和文件名，请对fields使用attachments(fileId,title).

Note :

• This sample script supposes that you have already known the event ID. If you need the method for retrieving the event IDs. Please tell me.
• If you want to retrieve the file ID and filename of the attachment file, please use attachments(fileId,title) for fields.
• Calendar.Events.get
• 字段
• Calendar.Events.get
• fields

如果我误解了你的问题，对不起.

If I misunderstand your question, I'm sorry.