diff --git a/lib/claper_web/live/event_live/event_form_component.ex b/lib/claper_web/live/event_live/event_form_component.ex
index 1cf2909..2d0e44f 100644
--- a/lib/claper_web/live/event_live/event_form_component.ex
+++ b/lib/claper_web/live/event_live/event_form_component.ex
@@ -47,7 +47,10 @@ defmodule ClaperWeb.EventLive.EventFormComponent do
 
   @impl true
   def handle_event("save", %{"event" => event_params}, socket) do
-    save_event(socket, socket.assigns.action, event_params)
+    case uploaded_entries(socket, :presentation_file) do
+      {_, []} -> save_event(socket, socket.assigns.action, event_params)
+      _ -> {:noreply, socket}
+    end
   end
 
   @impl true
diff --git a/lib/claper_web/live/event_live/event_form_component.html.heex b/lib/claper_web/live/event_live/event_form_component.html.heex
index 5b01249..27e32c3 100644
--- a/lib/claper_web/live/event_live/event_form_component.html.heex
+++ b/lib/claper_web/live/event_live/event_form_component.html.heex
@@ -1,7 +1,7 @@
 <div id="wrapper" class={if @container == :drawer, do: "flex h-full flex-col", else: ""}>
   <% upload_entry = Enum.at(@uploads.presentation_file.entries, 0) %>
   <% upload_progress = if upload_entry, do: upload_entry.progress, else: 0 %>
-  <% can_submit = upload_progress in [0, 100] && @changeset.valid? %>
+  <% can_submit = (is_nil(upload_entry) || upload_progress == 100) && @changeset.valid? %>
   <% presentation_file = Map.get(@event, :presentation_file) %>
   <% presentation_attached =
     not is_nil(presentation_file) && Map.get(presentation_file, :length, 0) > 0 &&
@@ -192,13 +192,14 @@
                 >
                   {gettext("Choose file")}
                 </label>
-                <.live_file_input upload={@uploads.presentation_file} class="sr-only" />
                 <p class="mt-3 text-xs text-base-content/50">
                   {gettext("PDF, PPT, or PPTX up to %{size} MB", size: @max_file_size)}
                 </p>
               </div>
             <% end %>
 
+            <.live_file_input upload={@uploads.presentation_file} class="sr-only" />
+
             <%= if upload_entry do %>
               <%= for err <- upload_errors(@uploads.presentation_file, upload_entry) do %>
                 <div class="alert alert-error mt-3 py-2 text-sm" role="alert">
diff --git a/test/claper_web/live/event_live_test.exs b/test/claper_web/live/event_live_test.exs
index f28ff4a..5da8206 100644
--- a/test/claper_web/live/event_live_test.exs
+++ b/test/claper_web/live/event_live_test.exs
@@ -114,6 +114,52 @@ defmodule ClaperWeb.EventLiveTest do
       assert has_element?(index_live, ~s(button[form="event-form"][disabled]))
     end
 
+    test "keeps the upload active and disables save while a presentation is starting", %{
+      conn: conn
+    } do
+      {:ok, new_live, _html} = live(conn, ~p"/events/new")
+
+      new_live
+      |> form("#event-form", event: %{name: "New event"})
+      |> render_change()
+
+      upload =
+        file_input(new_live, "#file-form", :presentation_file, [
+          %{name: "slides.pdf", content: "%PDF-1.4", type: "application/pdf"}
+        ])
+
+      assert render_upload(upload, "slides.pdf", 1) =~ "Uploading... 1%"
+      assert has_element?(new_live, ~s(#file-form input[type="file"]))
+      assert has_element?(new_live, ~s(button[form="event-form"][disabled]))
+
+      assert render_upload(upload, "slides.pdf", 99) =~ "New presentation ready"
+      assert has_element?(new_live, ~s|button[form="event-form"]:not([disabled])|)
+    end
+
+    test "does not create an event while a presentation upload is pending", %{conn: conn} do
+      {:ok, new_live, _html} = live(conn, ~p"/events/new")
+      event_count = Claper.Repo.aggregate(Claper.Events.Event, :count)
+
+      new_live
+      |> form("#event-form", event: %{name: "New event"})
+      |> render_change()
+
+      upload =
+        file_input(new_live, "#file-form", :presentation_file, [
+          %{name: "slides.pdf", content: "%PDF-1.4", type: "application/pdf"}
+        ])
+
+      assert {:ok, _metadata} = preflight_upload(upload)
+
+      html =
+        new_live
+        |> form("#event-form", event: %{name: "New event"})
+        |> render_submit()
+
+      assert html =~ "Uploading... 0%"
+      assert Claper.Repo.aggregate(Claper.Events.Event, :count) == event_count
+    end
+
     test "deletes event in listing", %{conn: conn, presentation_file: presentation_file} do
       {:ok, index_live, _html} = live(conn, ~p"/events/#{presentation_file.event.uuid}/edit")