diff --git a/css/default.css b/css/default.css
index c20aaae..bbaf0ce 100644
--- a/css/default.css
+++ b/css/default.css
@@ -141,7 +141,7 @@ footer .row {
 
 @media only screen and (min-width: 993px) {
   .nixos-sponsor .card {
-    height: 315px;
+    height: 350px;
   }
 
   .card {
diff --git a/images/sponsors/contextflow.png b/images/sponsors/contextflow.png
new file mode 100644
index 0000000..4e3c2ec
Binary files /dev/null and b/images/sponsors/contextflow.png differ
diff --git a/index.html b/index.html
index dbca311..d1cbf37 100644
--- a/index.html
+++ b/index.html
@@ -263,92 +263,29 @@ <h3 class="header center grey-text text-darken-2">Contact us</h3>
     <h3 class="header center grey-text text-darken-2">Sponsors</h3>
   </div>
 
-  <div class="row nixos-sponsor">
-    <div class="col s12 m6">
-      <div class="card">
-        <div class="card-content">
-          <span class="card-title">
-            <a href="/sponsoring.html">Become a sponsor</a>
-          </span>
-        </div>
-      </div>
-    </div>
+  <div class="col s12 m12">
+    If you want to become a sponsor simply <a href="#registration">book a sponsor ticket</a>.
   </div>
-  <!--div class="row nixos-sponsor">
-    <div class="col s12 m6">
-      <div class="card">
-        <div class="card-image" style="background-color: #eee;">
-          <img class="responsive-img" src="/images/sponsors/numtide.png" />
-        </div>
-        <div class="card-content">
-          <span class="card-title">Gold Sponsor</span>
-          <p>
-            <a href="https://www.numtide.com/">NumTide</a> is a Nix and DevOps consulting company. We provide build, test and deployment expertise from the
-            developer's machine to the cloud.</p>
-        </div>
-      </div>
-    </div>
-
-    <div class="col s12 m6">
-      <div class="card">
-        <div class="card-image" style="background-color: #eee;">
-          <img class="responsive-img" src="/images/sponsors/tweag.svg" />
-        </div>
-        <div class="card-content">
-          <span class="card-title">Gold Sponsor</span>
-          <p>
-            <a href="https://www.tweag.io/">Tweag I/O</a> is a Software R&amp;D Lab at the heart of Europe.</p>
-        </div>
-      </div>
-    </div>
-
-    <div class="col s12 m6">
-      <div class="card">
-        <div class="card-image" style="background-color: #212529;">
-          <img class="responsive-img" src="/images/sponsors/serokell.svg" />
-        </div>
-        <div class="card-content">
-          <span class="card-title">Gold Sponsor</span>
-          <p>
-            <a href="https://serokell.io/">Serokell</a> is a software development, consulting, and recruiting company. Prevalent in our practice is usage
-            of functional programming and scientific methods.</p>
-        </div>
-      </div>
-    </div>
 
+  <div class="row nixos-sponsor">
     <div class="col s12 m6">
       <div class="card">
         <div class="card-image" style="background-color: #eee;">
-          <img class="responsive-img" src="/images/sponsors/Mayflower-Logo-880.png" />
+          <img class="responsive-img" src="/images/sponsors/contextflow.png" />
         </div>
         <div class="card-content">
           <span class="card-title">Gold Sponsor</span>
           <p>
-            <a href="https://nixos.mayflower.consulting/">Mayflower</a> provides battle-tested
-            software engineering teams as well as consulting concerning infrastructure
-            and agile methodologies. We love and embrace Open Source by contributing
-            to the projects we use on a daily basis.
-          </p>
+	    <a href="http://contextflow.com">contextflow</a> revolutionizes
+	    the medical information search process via deep learning: our 3D
+	    image-based search engine for radiologists finds regions of
+	    interest within images; when a suspicious pattern is detected, we
+	    immediately provide visually similar cases &amp; and reference
+	    information helpful for diagnosis… within seconds.</p>
         </div>
       </div>
     </div>
-
-    <div class="col s12 m6">
-      <div class="card">
-        <div class="card-image" style="background-color: #7ccef3;">
-          <img class="responsive-img" src="/images/sponsors/rai-logo.png" />
-        </div>
-        <div class="card-content">
-          <span class="card-title">Gold Sponsor</span>
-          <p>
-            At <a href="http://relational.ai/">relationalAI</a>, we develop novel Artificial Intelligence technologies to solve complex business problems. Many of these problems do not lend themselves to consumer-oriented AI methods. Our technology exploits the rich interdependencies and structure inherent in every business to deliver results that are orders of magnitude better than traditional AI and machine learning.
-          </p>
-        </div>
-      </div>
-    </div>
-
-
-  </div -->
+  </div>
 
   <!-- div class="row">
     <div class="col s12 m12">