Given the task definition and input, reply with output. In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: Lithuania had a centuries long tradition of statehood following the coronation of Mindaugas the King of Lithuania.
After the last Partition of the Polish-Lithuanian Commonwealth in 1795, Lithuania was annexed by the Russian Empire. During the 19th century, both the Lithuanians and the Poles attempted to restore their independence. Lithuanians rebelled during the 1830 November Uprising and the 1863 January Uprising, but their first real opportunity arose when both Russia and Germany were weakened during World War I.In 1915, Germany occupied western parts of the Russian Empire. After the Russian Revolution in 1917, Germany conceived the geopolitical strategy of Mitteleuropa – a regional network of puppet states that would serve as a buffer zone – and agreed to allow the Vilnius Conference, hoping that it would proclaim that the Lithuanian nation wanted to detach itself from Russia and establish a closer relationship with Germany. However, this strategy backfired; the conference, held on 18–22 September 1917, adopted a resolution that an independent Lithuania should be established and that a closer relationship with Germany would be conditional on Germany's formal recognition of the new state. On 21 September, the 214 attendees at the conference elected a 20-member Council of Lithuania to codify this resolution. The German authorities did not allow that resolution to be published, but they did permit the Council to proceed. The Vilnius Conference also resolved that a constituent assembly be elected "in conformity with democratic principles by all the inhabitants of Lithuania".
What was the name of the event where a resolution was adopted that established an independent Lithuania?