How long in advance should I book a trip to Europe?

Generally about one month in advance, you need to apply for a passport and visa first.

Guangdong China Youth Travel Service Yangji Branch (hereinafter referred to as Guangdong Youth Travel Service Yangji Branch) and Guangdong China Youth Travel Service, established in 1979, are large state-owned enterprises directly under the Guangdong Provincial Committee of the Communist Youth League. Business scope: comprehensive services such as inbound tourism, domestic tourism, outbound tourism, business exhibition, special tourism and visa, reservation, air ticket, car rental, and tour guide translation. He is good at planning and arranging tourism business activities of public utilities, universities, enterprises and overseas institutions, and providing tailor-made personalized tourism routes.