What does it mean to give the hotel the first red envelope?

It means to start giving out red envelopes.

Hotels (also known as hotels, hotels, inns, guest houses, business trips, inns, hotels in China, and hotels in Malaysia and Singapore) are basically defined as business organizations that provide safe and comfortable spaces for users to have a short rest or sleep.

A hotel is a place where guests can stay and eat. Specifically, a hotel is an organization that provides services to its guests through the sale of rooms, restaurants and comprehensive service facilities, taking its buildings as evidence, so as to obtain economic benefits. The hotel mainly provides accommodation services, living services and facilities (bedtime services), catering, games, entertainment, shopping, business centers, banquets and conferences for tourists.