adapted

courses/meta/upcoming.md

+---
+layout: default
+title: Upcoming Courses
+permalink: /courses/
+---
+
+{% assign courses = site.pages | where: "layout", "course" | sort: "title" %}
+
+<ul class="collection">
+    {% for item in courses %}
+        {% if item.semesters contains site.upcoming %}
+            {% include course.html %}
+        {% endif %}
+    {% endfor %}
+</ul>