1. A game server connected with a plurality of game terminals through a communication network, each game terminal executing an online game according to a game program of the game server through an operation of a player, each game terminal operating an operation character in a virtual space in the game server, the game program including a plurality of events, at least one of the plurality of events having a specific event to be played by forming a party of at least two characters; the game server comprising: a processor; and a memory including the game program that, when executed by the processor through the operation of each game terminal, causes the processor to perform operations including: forming the party of the at least two characters; prohibiting a character included in the party from executing an event other than the specific event of the plurality of events; judging whether or not at least one of the at least two characters included in the party has cleared the specific event; executing a process corresponding to clearing of the specific event for all of the at least two characters included in the party when the processor judges that the specific event has been has been cleared; updating player information of all of the at least two characters included in the party for which the specific event has not been judged as being cleared into a status having the specific event being judged cleared; and releasing the event other than the specific event to the at least two characters included in the party.