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=== 2018 ===
*'''May 16''' Matsuri's Twitter account creation date.
*'''May 24''' Her YouTube channel creation date.
*'''June 01''' HerDebuted debuton dayYouTube, and her first uploaded video.<ref>(Jun. 1, 2018) Retrieved from https://youtu.be/dJ-8EGi5zCs</ref>
*'''Aug. 26''' She achieved herAchieved 10,000 YouTube subscriber milestone.<ref>(Aug. 26, 2018) Retrieved from https://twitter.com/natsuiromatsuri/status/1033717141684408320</ref>
*'''Nov. 01''' She revealed herRevealed second 2DLive2D outfit.<ref>(Nov. 1, 2018) Retrieved from https://youtu.be/DQE2J9SqTrc</ref>
*'''Dec. 31''' Matsuri's membershipMembership feature opened.<ref>(Dec. 31, 2018) Retrieved from https://twitter.com/natsuiromatsuri/status/1079768768706883584</ref>
=== 2019 ===
*'''Jan. 08''' She achieved herAchieved 25,000 YouTube subscriber milestone.<ref>(Jan 8, 2019) Retrieved from https://twitter.com/natsuiromatsuri/status/1082622673748877314</ref>
*'''Feb. 14''' She achieved herAchieved 100,000 bilibili subscriber milestone.<ref>(Feb. 14, 2019) Retrieved from https://twitter.com/natsuiromatsuri/status/1096049240252399616</ref>
*'''Apr. 13''' She achieved herAchieved 50,000 YouTube subscriber milestone.<ref>(Apr. 13, 2019) Retrieved from https://twitter.com/natsuiromatsuri/status/1116746885681696769</ref>
*'''Apr. 14''' Matsuri debutedDebuted her 3D model.<ref>(Apr. 14, 2019) Retrieved from https://youtu.be/qGn0dVLJwSc</ref>
*'''June 01''' SheHeld held her 11st year anniversary commemorative stream.<ref>(Jun. 01, 2019) Retrieved from https://www.youtube.com/watch?v=RyYq-wGnH2w</ref>
*'''June 02''' She achieved herAchieved 70,000 YouTube subscriber milestone.<ref>(June 2, 2019) Retrieved from https://twitter.com/natsuiromatsuri/status/1135367652145156096</ref>
*'''July 22''' SheHeld held hera birthday stream.<ref>(Jul. 22, 2019) Retrieved from https://www.youtube.com/watch?v=HGeFvO2MFqA</ref>
*'''Aug. 06''' Matsuri debutedDebuted her 3D swimsuit outfit.<ref>(Aug. 06, 2019) Retrieved from https://youtu.be/tbUIYEQyNlI</ref>
*'''Aug. 27''' She achieved herAchieved 100,000 YouTube subscriber milestone.<ref>(Aug. 27, 2019) Retrieved from https://twitter.com/natsuiromatsuri/status/1166263850267627520</ref>
*'''Oct. 24''' Matsuri temporarilyTemporarily suspended activities due to health reasons.<ref>(Oct. 24, 2019) Retrieved from https://www.youtube.com/watch?v=f3T5Ml_5UcI</ref>
*'''Nov. 02''' She resumed herResumed activities.<ref>(Nov. 02, 2019) Retrieved from https://www.youtube.com/watch?v=EvENgIWhL48</ref>
*'''Dec. 08''' She achieved herAchieved 150,000 YouTube subscriber milestone.<ref>(Dec. 8, 2019) Retrieved from https://twitter.com/natsuiromatsuri/status/1203520746284183552</ref>
=== 2020 ===
*'''Jan. 01''' Matsuri revealed herRevealed New Years outfit.<ref>(Jan. 1, 2020) Retrieved from https://youtu.be/DHMUymmD-eE</ref>
*'''Jan. 24''' She participatedParticipated in Hololive's first live, ''"[[Nonstop Story]]"'', and debuted her 3D idol costume.
*'''Jan. 24''' Her YouTube channel was erroneously demonetized due to YouTube's AI system.
*'''Jan. 28''' She achieved herAchieved 200,000 YouTube subscriber milestone.<ref>(Jan. 28, 2020) Retrieved from https://twitter.com/natsuiromatsuri/status/1222101284745932800</ref>
*'''Jan. 31''' Matsuri regainedRegained monetization for her YouTube channel.
*'''Mar. 16''' She achieved herAchieved 250,000 YouTube subscriber milestone.<ref>(Mar. 16, 2020) Retrieved from https://twitter.com/natsuiromatsuri/status/1239444062089793536</ref>
*'''Apr. 25''' She achieved herAchieved 300,000 YouTube subscriber milestone.<ref>(Apr. 25, 2020) Retrieved from https://twitter.com/natsuiromatsuri/status/1254077536595660810</ref>
*'''Jun. 20''' Matsuri performed herPerformed 2nd anniversary 3D live concert, with [[Hoshimachi Suisei]] as a special guest.<ref>(Jun. 20, 2020) Retrieved from https://www.youtube.com/watch?v=APN3rNzfNnw</ref>
*'''Jun. 20''' She released herReleased first original music video, ''"The Summer Flower I Gaze Upon with You (君と眺める夏の花)"''.<ref>(Jun. 20, 2020) Retrieved from https://www.youtube.com/watch?v=llv_1-WEQGg</ref>
*'''Jun. 23''' She achieved herAchieved 400,000 YouTube subscriber milestone.<ref>(Jun. 23, 2020) Retrieved from https://twitter.com/natsuiromatsuri/status/1275355502407344128</ref>
*'''Jun. 26''' Matsuri and [[Rikkaroid]]'s collaboration cover of ''"Hakujitsu (白日)"'' By ''"King Gnu"'' reached 1 million views.<ref>(Jun. 26, 2020) Retrieved from https://twitter.com/rikkaroid/status/1276358692506460163</ref>
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