diff --git a/contrib/plugins/calendar/main.lua b/contrib/plugins/calendar/main.lua
index ba338b4..bf16007 100644
--- a/contrib/plugins/calendar/main.lua
+++ b/contrib/plugins/calendar/main.lua
@@ -144,12 +144,24 @@ end
 
 -- Get events within a date range (inclusive)
 function M.get_events(params, end_date)
+  -- Debug: log what we received
+  print("get_events: params type=" .. type(params) .. ", end_date type=" .. type(end_date))
+  if type(params) == "table" then
+    for k, v in pairs(params) do
+      print("  params[" .. tostring(k) .. "] type=" .. type(v))
+    end
+  end
   -- Backward compat: support positional (start, end) and table {start=, end=}
   if type(params) == "string" then
-    return M.get_events{ start_date = params, ["end"] = end_date or params }
+    print("get_events: backward compat path, end_date=" .. tostring(end_date))
+    local e = end_date
+    if type(e) ~= "string" then e = nil end
+    return M.get_events{ start_date = params, ["end"] = e or params }
   end
   local start_date = params.start_date or params.start
+  if type(start_date) ~= "string" then print("WARN get_events start_date not string: " .. type(start_date)); start_date = tostring(start_date) end
   local end_date = params["end"] or params.end_date or params.end_date
+  if type(end_date) ~= "string" then print("WARN get_events end_date not string: " .. type(end_date)); end_date = start_date end
   if not start_date then error("start_date required") end
   if not end_date then end_date = start_date end
   return verstak.db.query(