diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cdf0003b86c9..a7e4eb476afd 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -5,6 +5,7 @@ on:
   push:
     branches:
       - main
+if: false
 
 env:
   CARGO_TERM_COLOR: always
diff --git a/.github/workflows/course-schedule.yml b/.github/workflows/course-schedule.yml
index c109f06d0bfa..0453d47f1b3a 100644
--- a/.github/workflows/course-schedule.yml
+++ b/.github/workflows/course-schedule.yml
@@ -9,6 +9,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    if: false
 
     steps:
       - name: Checkout
@@ -33,3 +34,58 @@ jobs:
         with:
           name: course-schedule
           path: course-schedule/
+  upload:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v4
+
+      - name: "Setup Rust cache"
+        uses: ./.github/workflows/setup-rust-cache
+
+      - name: "Generate Schedule on upstream branch"
+        run: |
+          cargo run -p mdbook-course --bin course-schedule > upstream-schedule
+
+      - name: "Comment on PR if schedules differ"
+        uses: actions/github-script@v7.0.1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            var fs = require('fs');
+            var pr_number = 1856; // Number(fs.readFileSync('pr-number')); // XXX
+            var upstream = fs.readFileSync('upstream-schedule').toString();
+            var schedule = "CHANGED\n" + fs.readFileSync('upstream-schedule').toString(); // XXX
+            schedule = "<!-- course-schedule -->\n" +
+                       "# Changes to Course Schedule\n" +
+                       "This PR changes the course schedule. The new schedule is shown below.\n\n" +
+                       schedule;
+
+            // Look for existing comments
+            var existing_comment;
+            for await ({ data: comments } of github.paginate.iterator(github.rest.issues.listComments, {
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: pr_number
+            })) {
+              existing_comment = comments.find((c) => c.body.includes("<!-- course-schedule -->"));
+              if (existing_comment) {
+                break;
+              }
+            }
+
+            if (existing_comment) {
+              await github.rest.issues.updateComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: existing_comment.id,
+                body: schedule,
+              });
+            } else if (upstream != schedule) {
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: pr_number,
+                body: schedule,
+              });
+            }