change to python3

open the file in binary mode and encode utf8 gives the same result
as the python2 open and encode utf8

event_display.py

@@ -60,7 +60,7 @@ def calendarlist2jinja(html_list, filename):
     j2_env = Environment(loader=FileSystemLoader(this_dir),
                          trim_blocks=True)
     output = j2_env.get_template('template.html').render(html_list=html_list)
-    out_file = open(this_dir + filename, "w")
+    out_file = open(this_dir + filename, "wb")
     out_file.write(output.encode("utf-8"))
     out_file.close()