diff --git a/changelog.d/6731.bugfix b/changelog.d/6731.bugfix
new file mode 100644
index 0000000000..21f6e15cbd
--- /dev/null
+++ b/changelog.d/6731.bugfix
@@ -0,0 +1 @@
+Fix `/events/:event_id` deprecated API.
diff --git a/synapse/rest/client/v1/events.py b/synapse/rest/client/v1/events.py
index 4beb617733..25effd0261 100644
--- a/synapse/rest/client/v1/events.py
+++ b/synapse/rest/client/v1/events.py
@@ -70,7 +70,6 @@ class EventStreamRestServlet(RestServlet):
         return 200, {}
 
 
-# TODO: Unit test gets, with and without auth, with different kinds of events.
 class EventRestServlet(RestServlet):
     PATTERNS = client_patterns("/events/(?P<event_id>[^/]*)$", v1=True)
 
@@ -78,6 +77,7 @@ class EventRestServlet(RestServlet):
         super(EventRestServlet, self).__init__()
         self.clock = hs.get_clock()
         self.event_handler = hs.get_event_handler()
+        self.auth = hs.get_auth()
         self._event_serializer = hs.get_event_client_serializer()
 
     async def on_GET(self, request, event_id):
diff --git a/tests/rest/client/v1/test_events.py b/tests/rest/client/v1/test_events.py
index f340b7e851..ffb2de1505 100644
--- a/tests/rest/client/v1/test_events.py
+++ b/tests/rest/client/v1/test_events.py
@@ -134,3 +134,30 @@ class EventStreamPermissionsTestCase(unittest.HomeserverTestCase):
 
         # someone else set topic, expect 6 (join,send,topic,join,send,topic)
         pass
+
+
+class GetEventsTestCase(unittest.HomeserverTestCase):
+    servlets = [
+        events.register_servlets,
+        room.register_servlets,
+        synapse.rest.admin.register_servlets_for_client_rest_resource,
+        login.register_servlets,
+    ]
+
+    def prepare(self, hs, reactor, clock):
+
+        # register an account
+        self.user_id = self.register_user("sid1", "pass")
+        self.token = self.login(self.user_id, "pass")
+
+        self.room_id = self.helper.create_room_as(self.user_id, tok=self.token)
+
+    def test_get_event_via_events(self):
+        resp = self.helper.send(self.room_id, tok=self.token)
+        event_id = resp["event_id"]
+
+        request, channel = self.make_request(
+            "GET", "/events/" + event_id, access_token=self.token,
+        )
+        self.render(request)
+        self.assertEquals(channel.code, 200, msg=channel.result)
diff --git a/tests/unittest.py b/tests/unittest.py
index ddcd4becfe..b56e249386 100644
--- a/tests/unittest.py
+++ b/tests/unittest.py
@@ -463,7 +463,7 @@ class HomeserverTestCase(TestCase):
         # Create the user
         request, channel = self.make_request("GET", "/_matrix/client/r0/admin/register")
         self.render(request)
-        self.assertEqual(channel.code, 200)
+        self.assertEqual(channel.code, 200, msg=channel.result)
         nonce = channel.json_body["nonce"]
 
         want_mac = hmac.new(key=b"shared", digestmod=hashlib.sha1)