diff --git a/doc/source/_static/css/custom.css b/doc/source/_static/css/custom.css
index 41d23e977593..2f887c4dcdb2 100644
--- a/doc/source/_static/css/custom.css
+++ b/doc/source/_static/css/custom.css
@@ -394,3 +394,16 @@ table.autosummary tr > td:first-child > p > a > code > span {
 .table.example-table th:first-child {
   width: 30%;
 }
+
+.bd-header-announcement {
+  color: var(--pst-color-dark);
+}
+
+.bd-header-announcement::after {
+  background-color: var(--ray-blue);
+}
+
+.bd-header-announcement a {
+  color: var(--pst-color-dark);
+  text-decoration: underline;
+}
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 126d44d172a5..73a3fa716501 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -265,7 +265,7 @@ def render_svg_logo(path):
 # documentation.
 html_theme_options = {
     "use_edit_page_button": True,
-    "announcement": None,
+    "announcement": """Ray Summit unites the community. Submit a <b><a target="_blank" href="https://raysummit.anyscale.com/flow/anyscale/raysummit2024/landing/page/eventsite?utm_source=cfpraydocs_gl=1*949o36*_ga*Mzk2ODgxMTUwLjE3MTM4OTE0NzM.*_ga_T6EXHYG44V*MTcxNDA3ODUzNC43LjAuMTcxNDA3ODUzNC42MC4wLjEyMDk3NzQ2MjE">session proposal</a></b> to share your experience.""",
     "logo": {
         "svg": render_svg_logo("_static/img/ray_logo.svg"),
     },