diff --git a/web/app/mu-plugins/cbf-content-board-all-dates.php b/web/app/mu-plugins/cbf-content-board-all-dates.php
new file mode 100644
index 00000000..e505513e
--- /dev/null
+++ b/web/app/mu-plugins/cbf-content-board-all-dates.php
@@ -0,0 +1,60 @@
+<?php
+/**
+ * Show posts of any date on the PublishPress Content Board.
+ *
+ * The Content Board only lists posts whose publish date falls in its date
+ * range, which defaults to five weeks either side of today and applies even
+ * when no date filter is set. The board tracks workflow status, and a
+ * session's publish date is when its post was created, so older sessions in
+ * Pending Review never appear, and newer ones drop off as the range moves.
+ *
+ * The board passes its query args and the active date range through
+ * PP_Content_Board_posts_query_args, then adds its date condition in a
+ * posts_where filter. This tags the board's query with that range and removes
+ * the matching condition afterwards. If PublishPress changes how it writes the
+ * condition, nothing matches and the board keeps filtering by date as before.
+ *
+ * @package CBF
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+add_filter(
+	'PP_Content_Board_posts_query_args',
+	static function ( $args, $context = '', $enabled_filters = array(), $user_filters = array() ) {
+		if ( is_array( $args ) && ! empty( $user_filters['start_date'] ) && ! empty( $user_filters['end_date'] ) ) {
+			$args['cbf_content_board_range'] = array( $user_filters['start_date'], $user_filters['end_date'] );
+		}
+
+		return $args;
+	},
+	10,
+	4
+);
+
+add_filter(
+	'posts_where',
+	static function ( $where, $query ) {
+		global $wpdb;
+
+		$range = $query instanceof WP_Query ? $query->get( 'cbf_content_board_range' ) : null;
+
+		if ( ! is_array( $range ) || count( $range ) !== 2 ) {
+			return $where;
+		}
+
+		// The same condition PublishPress builds in posts_where_range().
+		$condition = $wpdb->prepare(
+			" AND ($wpdb->posts.post_date >= %s AND $wpdb->posts.post_date < %s)",
+			gmdate( 'Y-m-d', strtotime( $range[0] ) ) . ' 00:00:00',
+			gmdate( 'Y-m-d', strtotime( $range[1] ) ) . ' 23:59:59'
+		);
+
+		return str_replace( $condition, '', $where );
+	},
+	// After PublishPress's own posts_where filter, at the default priority.
+	11,
+	2
+);