Insert Item using Shareplum (python)

Question

I am new using python library shareplum. I have a sharepoint site with list named "Events". Inside that list there is a list item which is a folder with list items inside (EventsXXXX). I manage to update the Events list with a new item but I do not know how to move this item to EventsXXXX.

This is a snippet of my code:

user, password = 'xxxxx', 'xxxxxx'
auth      = HttpNtlmAuth('yyyyyyy\\'+user, password)
site      = Site('https://yyyyyyy/lib/zzzzz', version=Version.v2016, auth=auth)
folder    = 'https://yyyyyyy/lib/zzzzz/Lists/Events/EventsXXXX'
sp_list   = site.List('Events')

task_list = [{'Content Type': ......}]
sp_list.UpdateListItems(task_list, 'New', False)

The result is for Events list:

    ID      Title      Project  Fields
    9928    XXXXXX1    YYYYY    ZZZZZ
    1525    EventsXXXX YYYYY    KKKKK     --> this is an list item but it is a folder containing list items

                                          as ID 9928

Errors produced:

1. I cannot access EventsXXXX using sp_folder = site.Folder(folder)

Shareplum HTTP Post Failed : 401 Client Error: Unauthorized for url: https://xxxx/lib/xxxxx/_api/web/folders

2. EventsXXXX is not recognised when doing sp_list2 = site.List(folder)

Shareplum HTTP Post Failed : 500 Server Error: Internal Server Error for url: https://xxxx/lib/xxxx/_vti_bin/lists.asmx

I would appreciate any help to explain how to move item ID 9928 into the folder 1525 or how to save item ID 9928 into folder 1525, considering the above errors.