You've missed this bit
The legal gathering limits do not apply to essential work, education or training events. Attendees are not limited to gathering in groups of up to six people or two households.
Catering can be provided at meetings and events for essential work, education and training purposes. This does not extend to activities that are not strictly related to the essential work, education or training, such as private dining or social purposes with work colleagues. If an essential work, education or training activity changes into a primarily social gathering, then social contact and indoor hospitality restrictions apply, and the activity must stop
I think that covers it ?