Copy/pasting a reddit post I made a few months ago:
New Japan has several events throughout the year. First off, there are the "Big 4" PPVs, usually headlined by IWGP Heavyweight Championship matches...
Wrestle Kingdom: New Japan's biggest event, their Wrestlemania, held annually on January 4th at the Tokyo Dome.
Invasion Attack, their big Spring event, held annually in the Ryogoku Kokugikan (Sumo Hall), in late March/early April
DOMINION, New Japan's big Summer event, held in June/July, the last two years it has been held in Osaka-Jo Hall.
King of Pro-Wrestling, New Japan's fall anniversary show in October, also held in Sumo Hall.
New Japan also holds several major tournaments/leagues throughout the year.
New Japan Cup: A single-elimination tournament for New Japan heavyweights who don't hold a championship. The winner gets a choice of a shot at either the IWGP Heavyweight Championship, IWGP Intercontinental Championship, or NEVER Openweight Championship at Invasion Attack.
Best of the Super Juniors: A league tournament for Jr. Heavyweights in April/June, wrestlers are split into two blocks who then face each other, the wrestler from each block with the best record then face off in the final, and the winner (if it isn't the reigning champion) gets a Jr. Heavyweight championship match at DOMINION.
G1 Climax: The same as above, except for Heavyweights, held in July/August. The winner (if it isn't the reigning champion) gets a contract in a Money in the Bank-style briefcase to challenge the IWGP Heavyweight champion in the main event of Wrestle Kingdom. They must then defend the contract as a championship against anyone who defeated them in G1 block play until Wrestle Kingdom.
Super J Cup: A single-elimination tournament for Jr. heavyweights, seldom held but made its return in 2016. Features wrestlers from numerous Japanese promotions and not just NJPW.
Super Jr. Tag Tournament: A single-elimination tournament for Jr. Heavyweight Tag Teams held in November. Winner (if it isn't the reigning champions) get a Jr. Tag Team title match.
World Tag League: Same as the G1/BOSJ but for tag teams, held in December. Winning team (if it isn't the reigning champions) gets a IWGP Tag Championship match at Wrestle Kingdom.
Then, you have the minor events held throughout the year.
The New Beginning: Held in February, split into two events, one held in Osaka and another elsewhere. Each show is headlined by an IWGP Heavyweight and Intercontinental title match.
Wrestling Hinokuni and Dontaku: Held in late April/early May during Japan's Golden Week (a week of holidays and festivals).
DESTRUCTION: Held in September, usually split into two events but last year it was three. Usually headlined by the Intercontinental and NEVER titles.
Power Struggle: Held in November, usually headlined by an Intercontinental title match.
Then, you've got a wide variety of smaller shows, like New Year Dash (held at Korakuen Hall the day after Wrestle Kingdom), and Fantastica Mania (shows co-produced by NJPW and CMLL in Mexico) as well as tours and house shows leading up to the big events under the "Road To *insert name of event here" moniker. Occasionally these shows are aired on TV Asahi, Samurai TV, or on NJPWWorld.com.
New Japan doesn't have a weekly show except for World Pro-Wrestling (held weekly at 3am on TV-Asahi) which shows highlights of previous NJPW events and interviews with NJPW wrestlers. It airs on AXS.TV in the US with subtitled promos and Jim Ross and Josh Barnett calling the matches.
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