Fix typo

Author: sangwoo108

index.html

@@ -484,7 +484,7 @@ <h2 class="event-title">When</h2>
                 <h2 class="event-title">Time</h2>
               </div>
               <p class="event-text">오후 6시 30분 ~</p>
-              <p class="event-subtext">등록시작!</p>
+              <p class="event-subtext">등록 시작!</p>
             </div>
           </div>