diff --git a/_locales/en/messages.json b/_locales/en/messages.json
index fab877f8..bc62e80a 100644
--- a/_locales/en/messages.json
+++ b/_locales/en/messages.json
@@ -990,5 +990,13 @@
   "prefs_OptionText_GetCalendarEvent_infoline2": {
     "message": "You can change the prompt as you wish, but the response received from the AI must be in JSON format as specified in the default prompt!",
     "description": ""
+  },
+  "prefs_OptionText_get_calendar_event_Sparks_not_present": {
+    "message": "To use the calendar event feature, please install the ThunderAI Sparks addon.",
+    "description": ""
+  },
+  "prefs_OptionText_download_now": {
+    "message": "Download ThunderAI Sparks now!",
+    "description": ""
   }
 }
\ No newline at end of file
diff --git a/options/mzta-options.css b/options/mzta-options.css
index e3680a08..a34037e3 100644
--- a/options/mzta-options.css
+++ b/options/mzta-options.css
@@ -118,6 +118,12 @@ tr.conntype_google_gemini_api, tr.conntype_google_gemini_api2{
     font-style: italic;
 }
 
+#no_sparks td{
+    text-align: center;
+    padding: 1em !important;
+    background: #bbf7f1;
+}
+
 textarea.option-textarea{
     width: -moz-available;
     height: 10em;
@@ -244,4 +250,7 @@ input.option-input[type="text"]{
         background-color: rgb(2, 0, 100);
     }
 
+    #no_sparks td{
+        background: #3b514f;
+    }
 }
\ No newline at end of file
diff --git a/options/mzta-options.html b/options/mzta-options.html
index 1214b676..8cd6443e 100644
--- a/options/mzta-options.html
+++ b/options/mzta-options.html
@@ -344,6 +344,12 @@
           </label>
         </td>
       </tr>
+      <tr class="get_calendar_event_tr" id="no_sparks">
+        <td colspan="2">
+          <span>__MSG_prefs_OptionText_get_calendar_event_Sparks_not_present__</span>
+          <br><a href="https://addons.thunderbird.net/it/thunderbird/addon/thunderai-sparks">__MSG_prefs_OptionText_download_now__</a>
+        </td>
+      </tr>
       <tr>
         <td style="width:20em"><label>
           <span>__MSG_Debug__</span>
diff --git a/options/mzta-options.js b/options/mzta-options.js
index 1d81191b..81844d01 100644
--- a/options/mzta-options.js
+++ b/options/mzta-options.js
@@ -262,14 +262,17 @@ function disable_AddTags(){
   });
 }
 
-function disable_GetCalendarEvent(){
+async function disable_GetCalendarEvent(){
   let get_calendar_event = document.getElementById('get_calendar_event');
+  let no_sparks_tr = document.getElementById('no_sparks');
+  let is_spark_present = await checkSparksPresence()
   let conntype_select = document.getElementById("connection_type");
-  get_calendar_event.disabled = (conntype_select.value === "chatgpt_web");
+  get_calendar_event.disabled = (conntype_select.value === "chatgpt_web") || !is_spark_present;
   let get_calendar_event_tr_elements = document.querySelectorAll('.get_calendar_event_tr');
   get_calendar_event_tr_elements.forEach(get_calendar_event_tr => {
-    get_calendar_event_tr.style.display = (get_calendar_event.disabled) ? 'none' : 'table-row';
+    get_calendar_event_tr.style.display = get_calendar_event.disabled ? 'none' : 'table-row';
   });
+  no_sparks_tr.style.display = is_spark_present ? 'none' : 'table-row';
 }
 
 document.addEventListener('DOMContentLoaded', async () => {