consequently a substantial increase in numbers of tourists. In the spring of 2006, the hitherto biggest party of hospitality exchange service HC took place in Riga, counting 430 participants from 36 countries. On 21 November 2013, the roof of a supermarket collapsed in Zolitūde, one of the neighbourhoods of the city, possibly as a result of the weight of materials used in the construction of a garden on the roof. Fifty-four people were killed. Latvian President Andris Bērziņš described the disaster as "a large-scale murder of many defenceless people". Riga was the European Capital of Culture in 2014. During Latvia's Presidency of the Council of the European Union in 2015, the 4th Eastern Partnership Summit took place in Riga. Geography Riga is the second largest city (after Vilnius) in the three Baltic states: Lithuania, Latvia, and Estonia. Riga is home to approximately one tenth of the three Baltic countries' combined population. Administrative divisions Central District () Kurzeme District () Zemgale Suburb () Northern District () Vidzeme Suburb () Latgale Suburb () Riga's administrative divisions consist of six administrative entities: Central, Kurzeme and Northern districts and the Latgale, Vidzeme and Zemgale suburbs. Three entities were established on 1 September 1941, and the other three were established in October 1969. There are no official lower-level administrative units, but the Riga City Council Development Agency is working on a plan, which officially makes Riga consist of 58 neighbourhoods. The current names were confirmed on 28 December 1990. Climate The climate of Riga is humid continental (Köppen Dfb). The coldest months are January and February, when the average temperature is but temperatures as low as can be observed almost every year on the coldest days. The proximity of the sea causes frequent autumn rains and fogs. Continuous snow cover may last eighty days. The summers in Riga are mild and rainy with an average temperature of , while the temperature on the hottest days can exceed . Government The head of the city government in Riga is the mayor, or officially the Chairman of the Riga City Council. He is assisted by one or more Vice Mayors (deputy mayors). The current mayor since October 2020 is Mārtiņš Staķis elected from Movement For!, which is a part of the Development/For!/Progressives faction, but on 24 March 2022, he left the party. The three other parties in the governing coalition each received a Vice Mayor post. The