MOWW coverage includes a Blanket Additional Insured endorsement meaning that parties are added as additional insureds automatically as long as there is a signed written contract or agreement in place requiring that status. However, some facilities/venues require that named additional insured be specified on the certificate of insurance (COI).
If a list is required and not provided, the COI received will be insufficient and you will have to resubmit your request again but with all the information needed, and likely will incur at least a 10-day delay for your facility/venue to receive the COI needed for your event.