Update ciba2021 start date

Change-Id: Ifcc0b7d64f61b18745488eb22102d3836e663189
diff --git a/concerts/ciba2021.json b/concerts/ciba2021.json
index 5d89788..9c207e7 100644
--- a/concerts/ciba2021.json
+++ b/concerts/ciba2021.json
@@ -2,7 +2,7 @@
   "codename": "ciba2021",
   "title": "Dones de Musicaula en concert",
   "subtitle": "La Ciba - 7 de març del 2021",
-  "begins": 1615137300,
+  "begins": 1615071600,
   "ends": 1615147200,
   "hasTimes": false,
   "customFooter": "<div style='text-align: right; margin: 16px 0;'><img src='img/logo-ciba.png' style='height: 75px;'></div>",