15 events the sources record for this year, grouped by region.
What happened
China (9)
The lord of Tsushima escorts the drifted Jeju people (Annals of the Joseon Dynasty 宣祖實錄 二十年 · 宣祖實錄 11책 21권 8장 B면 · 기사 wna_12007003_001)
The hostile Hu capture Nokdundo, and the military farmland is abolished (Annals of the Joseon Dynasty 宣祖修正實錄 二十年 · 宣祖修正實錄 5책 21권 27장 A면 · 기사 wnb_12009001_001)
The South Byeongsa reports that Chamsa Yi Ha and others repelled the barbarians at Hyesanjin (Annals of the Joseon Dynasty 宣祖實錄 二十年 · 宣祖實錄 11책 21권 15장 B면 · 기사 wna_12009024_001)
The Uiju Magistrate reports that soldiers and commoners who crossed into China stole official timber at Undu-ri (Annals of the Joseon Dynasty 宣祖實錄 二十年 · 宣祖實錄 11책 21권 16장 A면 · 기사 wna_12010009_002)
The North Byeongsa reports that he jailed Gyeongheung Magistrate Yi Gyeong-rok and others who mishandled the military equipment when the hostile Hu invaded Nokdundo (Annals of the Joseon Dynasty 宣祖實錄 二十年 · 宣祖實錄 11책 21권 16장 A면 · 기사 wna_12010010_002)
The lord of Tsushima reports that an envoy of Japan's new king has reached Tsushima, and presents a diplomatic letter (Annals of the Joseon Dynasty 宣祖實錄 二十年 · 宣祖實錄 11책 21권 16장 B면 · 기사 wna_12010020_001)
North Byeongsa Yi Il reports the fall of Nokdundo (Annals of the Joseon Dynasty 宣祖實錄 二十年 · 宣祖實錄 11책 21권 21장 B면 · 기사 wna_12012026_001)
Hideyoshi's adopted son Hidekatsu attacked Iwaishi Castle, assisted by Gamo Ujisato and Maeda Toshiie. After the castle fell, Akizuki Tanezane surrendered. (Rai Sanyō, Nihon Gaishi 권15 · 天正15년 4월 단락)
Shimazu Yoshihisa shaved his head and came out to Taihei-ji with five or six close retainers to surrender, and Hideyoshi received him. (Rai Sanyō, Nihon Gaishi 권15 · 天正15년 5월 단락)
Korean Peninsula (3)
The Jeolla governor reports that 18 Japanese ships invaded Heungyang and that Nokdo Kwon-gwan Yi Dae-won died in battle (Annals of the Joseon Dynasty 宣祖實錄 二十年 · 宣祖實錄 11책 21권 2장 A면 · 기사 wna_12002026_001)
The Jeolla Right Naval Commander reports a Japanese invasion of Garipo (Annals of the Joseon Dynasty 宣祖實錄 二十年 · 宣祖實錄 11책 21권 2장 A면 · 기사 wna_12002027_001)
The Japanese national envoy Tachibana Yasuhiro comes to pay tribute (Annals of the Joseon Dynasty 宣祖修正實錄 二十年 · 宣祖修正實錄 5책 21권 27장 A면 · 기사 wnb_12009001_003)
Southeast Asia (1)
Military governor Trịnh Tùng attacked and broke the prefectures of Trường An, Thiên Quan and others. (Đại Việt sử ký toàn thư 本紀卷之十七 「'''丁亥，十年（莫端泰二年，明」)
Eastern Europe & Russia (2)
In the name of the Polish Diet, the boyars Stepan Godunov and Troyekurov were stopped on 12 July 1587 at Okunev village, 15 versts before Warsaw. (Karamzin, History of the Russian State 제10권 II장)
The Voevoda of Tobolsk invited Seydyak, Saltan and Karacha to a banquet; though they suspected poison he offered them cups, then gave a signal, attacked and captured them. (Remezov Siberian Chronicle 레메조프본 ст.123–125)