Final answer:
The guests at Arthur's help with various tasks to prepare for supper and gain presents. They assist in transforming the sitting-room into a dining-room, setting up tables and chairs, and arranging flowers.
Step-by-step explanation:
The guests at Arthur's help with various tasks to prepare for supper and gain presents. They assist in transforming the sitting-room into a dining-room, setting up tables and chairs, and arranging flowers. By actively participating in these preparations, the guests show their appreciation and contribute to the festivities.