CREATE TABLE city (city_id DECIMAL, city TEXT, hanzi TEXT, hanyu_pinyin TEXT, regional_population DECIMAL, gdp DECIMAL)
CREATE TABLE match (match_id DECIMAL, date TEXT, venue TEXT, score TEXT, result TEXT, competition TEXT)
CREATE TABLE hosting_city (year DECIMAL, match_id DECIMAL, host_city TEXT)
CREATE TABLE temperature (city_id DECIMAL, jan DECIMAL, feb DECIMAL, mar DECIMAL, apr DECIMAL, jun DECIMAL, jul DECIMAL, aug DECIMAL, sep DECIMAL, oct DECIMAL, nov DECIMAL, dec DECIMAL)

Find the city that hosted the most events.
SELECT T1.city FROM city AS T1 JOIN hosting_city AS T2 ON T1.city_id = T2.host_city GROUP BY T2.host_city ORDER BY COUNT(*) DESC LIMIT 1
SELECT "T1"."city" FROM "city" AS "T1" JOIN "hosting_city" AS "T2" ON "T1"."city_id" = "T2"."host_city" GROUP BY "T2"."host_city" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1