Final answer:
The Ten Boom family practiced emergency drills to protect their guests during the Holocaust.
Step-by-step explanation:
The Ten Boom family and their guests practiced many times for emergency drills during the Holocaust. These drills were crucial as they had to quickly hide from Nazi raids due to their efforts in sheltering Jews and other refugees. The message references preparations for an event, which might relate to the communal efforts necessary in times of danger—akin to those undertaken by the Ten Boom family. However, the given texts do not describe these drills but discuss other forms of gatherings and interactions.