📝 Add FastAPI Conf '26 announcement to docs (#15457)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

README.md

@@ -118,6 +118,12 @@ The key features are:
 
 ---
 
+## FastAPI Conf
+
+[**FastAPI Conf '26**](https://fastapiconf.com) is happening on **October 28, 2026** in **Amsterdam, NL**. All about FastAPI, right from the source. 🎤
+
+<a href="https://fastapiconf.com"><img src="https://fastapi.tiangolo.com/img/fastapi-conf.jpeg" alt="FastAPI Conf '26 - October 28, 2026 - Amsterdam, NL"></a>
+
 ## FastAPI mini documentary
 
 There's a [FastAPI mini documentary](https://www.youtube.com/watch?v=mpR8ngthqiE) released at the end of 2025, you can watch it online:

docs/en/docs/index.md

@@ -117,6 +117,12 @@ The key features are:
 
 ---
 
+## FastAPI Conf { #fastapi-conf }
+
+[**FastAPI Conf '26**](https://fastapiconf.com) is happening on **October 28, 2026** in **Amsterdam, NL**. All about FastAPI, right from the source. 🎤
+
+<a href="https://fastapiconf.com"><img src="https://fastapi.tiangolo.com/img/fastapi-conf.jpeg" alt="FastAPI Conf '26 - October 28, 2026 - Amsterdam, NL"></a>
+
 ## FastAPI mini documentary { #fastapi-mini-documentary }
 
 There's a [FastAPI mini documentary](https://www.youtube.com/watch?v=mpR8ngthqiE) released at the end of 2025, you can watch it online:

docs/en/overrides/main.html

@@ -10,6 +10,13 @@
         </span> Join the <strong>FastAPI Cloud</strong> waiting list 🚀
       </a>
     </div>
+    <div class="item">
+      <a class="announce-link" href="https://fastapiconf.com" target="_blank">
+        <span class="twemoji">
+          {% include ".icons/material/calendar-star.svg" %}
+        </span> <strong>FastAPI Conf '26</strong> — Oct 28, 2026, Amsterdam 🎤
+      </a>
+    </div>
     <div class="item">
       <a class="announce-link" href="https://x.com/fastapi" target="_blank">
         <span class="twemoji">