description: string
hide_package_listings: boolean
When true (and the group is a package) the package's member listings are hidden from buyers, tickets, and confirmation emails — only admins see the breakdown.
id: number
is_package: boolean
When true the group is a bookable "package": its member listings can carry
per-listing price overrides (the group dimension of listing_prices) and
fixed per-package quantities (group_listings.quantity).
max_attendees: number
name: string
slug: string
slug_index: BlindIndex
terms_and_conditions: string