diff --git a/index.php b/index.php
index 3ff14c4..e1aa3cd 100644
--- a/index.php
+++ b/index.php
@@ -95,9 +95,10 @@ if ($action === 'config') {
 
 $hasEvent = isset($_REQUEST['event']);
 if (!$isConfig and $hasSupplier) {
+	$start = new \DateTime($config[$supplier]['start']);
 	if (!$hasEvent) {
 		$now = new \DateTime('now');
-		$current = new \DateTime($config[$supplier]['start']);
+		$current = clone $start;
 		$frequency = \DateInterval::createFromDateString($config[$supplier]['frequency']);
 		$maxIterations = 1000;
 		while (
@@ -107,10 +108,20 @@ if (!$isConfig and $hasSupplier) {
 		$nextEvent = $current->format('Y-m-d');
 		header(sprintf('Location: %s?supplier=%s&event=%s', $requestUrl, $supplier, $nextEvent));
 		die();
+	} else {
+		$event = $_REQUEST['event'];
+		$current = new \DateTimeImmutable($event);
+		$frequency = \DateInterval::createFromDateString($config[$supplier]['frequency']);
+		$previous = $current->sub($frequency);
+		$previousEvent = $previous->format('Y-m-d');
+		if (false and !array_key_exists($previousEvent, $data[$supplier]))
+			unset($previousEvent);
+		$next = $current->add($frequency);
+		$nextEvent = $next->format('Y-m-d');
+		if (false and !array_key_exists($nextEvent, $data[$supplier]))
+			unset($nextEvent);
 	}
 
-	$event = $_REQUEST['event'];
-
 	switch ($action) {
 	case 'insert' :
 	case 'delete' :
@@ -295,7 +306,32 @@ if (!$isConfig and $hasSupplier) {
 				<section class="container-fluid">
 					<div class="row my-3">
 						<div class="col">
-							<h1><?php echo $config[$supplier]['title']; ?></h1>
+							<h1>
+								<?php echo $config[$supplier]['title']; ?>
+								
+								<div class="btn-group float-end" role="group">
+									<?php if (isset($previousEvent)) : ?>
+										<a class="btn btn-outline-primary" href="<?php printf('%s?supplier=%s&event=%s', $requestUrl, $supplier, $previousEvent); ?>" title="Événement précédent">
+											<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrow-left" viewBox="0 0 16 16">
+												<path fill-rule="evenodd" d="M15 8a.5.5 0 0 0-.5-.5H2.707l3.147-3.146a.5.5 0 1 0-.708-.708l-4 4a.5.5 0 0 0 0 .708l4 4a.5.5 0 0 0 .708-.708L2.707 8.5H14.5A.5.5 0 0 0 15 8z"/>
+											</svg>
+										</a>
+									<?php endif; ?>
+									<a class="btn btn-outline-primary" href="<?php printf('%s?supplier=%s&event=%s', $requestUrl, $supplier, $event); ?>" title="Cet événement">
+										<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-link" viewBox="0 0 16 16">
+											<path d="M6.354 5.5H4a3 3 0 0 0 0 6h3a3 3 0 0 0 2.83-4H9c-.086 0-.17.01-.25.031A2 2 0 0 1 7 10.5H4a2 2 0 1 1 0-4h1.535c.218-.376.495-.714.82-1z"/>
+											<path d="M9 5.5a3 3 0 0 0-2.83 4h1.098A2 2 0 0 1 9 6.5h3a2 2 0 1 1 0 4h-1.535a4.02 4.02 0 0 1-.82 1H12a3 3 0 1 0 0-6H9z"/>
+										</svg>
+									</a>
+									<?php if (isset($nextEvent)) : ?>
+										<a class="btn btn-outline-primary" href="<?php printf('%s?supplier=%s&event=%s', $requestUrl, $supplier, $nextEvent); ?>" title="Événement suivant">
+											<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrow-right" viewBox="0 0 16 16">
+												<path fill-rule="evenodd" d="M1 8a.5.5 0 0 1 .5-.5h11.793l-3.147-3.146a.5.5 0 0 1 .708-.708l4 4a.5.5 0 0 1 0 .708l-4 4a.5.5 0 0 1-.708-.708L13.293 8.5H1.5A.5.5 0 0 1 1 8z"/>
+											</svg>
+										</a>
+									<?php endif; ?>
+								</div>
+							</h1>
 							<?php if (!empty($config[$supplier]['description'])) : ?>
 							<p class="lead"><?php echo $config[$supplier]['description']; ?></p>
 							<?php endif; ?>