URL     = "https://b24-ar17wx.bitrix24.by/rest/1/h0m...";
    EventID = "2164";

    EventStucture = New Structure;

    EventStucture.Insert("ownerId"      , 1);
    EventStucture.Insert("type"         , "user");
    EventStucture.Insert("name"         , "Modified event");
    EventStucture.Insert("description"  , "New event description");
    EventStucture.Insert("importance"   , "low");
    EventStucture.Insert("private_event", "Y");

    Result = OPI_Bitrix24.UpdateCalendarEvent(URL, EventID, EventStucture);

    URL        = "b24-ar17wx.bitrix24.by";
    Token      = "4f8db968006e9f06006b12e400000001000...";
    EventID    = "2168";
    CalendarID = "1208";

    Result = OPI_Bitrix24.UpdateCalendarEvent(URL, EventID, EventStucture, Token);