@Pam2531
First thing I would do is contact the owner and advise them of the issue and give them the opportunity to address the issue - they may not even be aware this is happening. Hosts usually don't want "parties" as their listing can be suspended if they permit them. Guests don't always comply with the no parties rule.
If you don't have their contact info, you can use the "Message the Host" button on the Airbnb listing itself - it's at the bottom of the listing page:

If the Host/Owner doesn't respond to you timely, then you can contact Airbnb's Neighborhood Support:
Neighborhood Support
https://www.airbnb.com/help/article/3290