Final answer:
In 1921, Duncan Campbell Scott enforced the ban on the Potlatch ceremony, which was part of Canada's policies on the assimilation of Indigenous cultures.
Step-by-step explanation:
Duncan Campbell Scott was an official in the Canadian government who played a significant role in the administration of policies affecting Indigenous peoples. In 1921, in relation to the Potlatch, Duncan Campbell Scott did not actively participate in the ceremony, provide estimates for the event, or oppose the Potlatch ban. Instead, Duncan Campbell Scott was involved in the enforcement of the ban on the Potlatch ceremony. This ban was part of a broader set of policies aimed at assimilation and suppression of Indigenous cultures. A Potlatch was a socio-political ceremony important to the Pacific Northwest Indigenous groups, where status and wealth were demonstrated through generosity and distribution of gifts.