After the Klaipėda Revolt in 1923, Klaipėda Region (including Rambynas) became part of Lithuania. The hill became a frequently visited location and developed into a kind of resort. The nearby village of Bitėnai had three restaurants. Celebrations of the Saint Jonas' Festivals became grand affairs attended by many dignitaries. For example, in 1929, the celebrations were attended by a delegation from the League of Nations; its head even swore an improvised oath in the name of pagan thunder god Perkūnas. In 1928, Martynas Jankus built an altar and started keeping a guestbook, which is known as the Eternal Book of Rambynas. After World War II, authorities of the Lithuanian SSR allowed to resume the celebration of the Saint Jonas' Festivals in 1957. They even built a cement stage for events (it was demolished in 2010). German writer Johannes Bobrowski described old time celebrations on Rambynas in his 1966 novel "Litauische Claviere".