A tampermonkey script

// ==UserScript==
// @name         filter event by aj club name
// @namespace    http://tampermonkey.net/
// @version      0.1
// @require http://code.jquery.com/jquery-3.3.1.min.js
// @description  add a club index in the head then you could get by event list by club!
// @author       Matt
// @match        https://www.audax-japan.org/*
// @grant        none
// ==/UserScript==


(function () {
  'use strict';
  function onlyUnique(value, index, self) {
    return self.indexOf(value) === index;
  }

  function onlyShowme(event) {
    $("table > tbody > tr").each(function () {
      $(this).show();
      if ($(this).find("td:nth-child(3)").text() !== event.target.text) {
        $(this).hide();
      }
    });
  }

  var club_list = [];
  var only_unique = [];

  $("table > tbody > tr > td:nth-child(3)").each(function () {
    club_list.push($(this).text());
    only_unique = club_list.filter(onlyUnique).filter(function (e) {
      return e !== ''
    }).filter(function (e) {
      return e !== '主催'
    });
  });

  for (var i = 0; i < only_unique.length; i++) {
    $("#post-21795 > div").prepend("<a id='" + only_unique[i] + "' style='padding:3px;cursor: context-menu;'>" + only_unique[i] + "</a>");
  }
  for (var j = 0; j < only_unique.length; j++) {
    $("#" + only_unique[j]).click(onlyShowme);
  }

})();