diff --git a/telethon/events/chataction.py b/telethon/events/chataction.py
index 9f65a920..6649957f 100644
--- a/telethon/events/chataction.py
+++ b/telethon/events/chataction.py
@@ -251,7 +251,7 @@ class ChatAction(EventBuilder):
         @property
         def user(self):
             """
-            The single user that takes part in this action (e.g. joined).
+            The first user that takes part in this action (e.g. joined).
 
             Might be ``None`` if the information can't be retrieved or
             there is no user taking part.
@@ -267,6 +267,14 @@ class ChatAction(EventBuilder):
             if self.input_users:
                 return self._input_users[0]
 
+        @property
+        def user_id(self):
+            """
+            Returns the marked signed ID of the first user, if any.
+            """
+            if self.input_users:
+                return utils.get_peer_id(self._input_users[0])
+
         @property
         def users(self):
             """
@@ -311,3 +319,11 @@ class ChatAction(EventBuilder):
                     except (TypeError, ValueError):
                         pass
             return self._input_users
+
+        @property
+        def user_ids(self):
+            """
+            Returns the marked signed ID of the users, if any.
+            """
+            if self.input_users:
+                return [utils.get_peer_id(u) for u in self._input_users]
diff --git a/telethon/events/common.py b/telethon/events/common.py
index 8c475973..057be9f4 100644
--- a/telethon/events/common.py
+++ b/telethon/events/common.py
@@ -192,6 +192,14 @@ class EventCommon(abc.ABC):
 
         return self._chat
 
+    @property
+    def chat_id(self):
+        """
+        Returns the marked integer ID of the chat, if any.
+        """
+        if self._chat_peer:
+            return utils.get_peer_id(self._chat_peer)
+
     def __str__(self):
         return TLObject.pretty_format(self.to_dict())
 
diff --git a/telethon/events/newmessage.py b/telethon/events/newmessage.py
index 5c21bb36..d443909a 100644
--- a/telethon/events/newmessage.py
+++ b/telethon/events/newmessage.py
@@ -258,6 +258,14 @@ class NewMessage(EventBuilder):
 
             return self._sender
 
+        @property
+        def sender_id(self):
+            """
+            Returns the marked sender integer ID, if present.
+            """
+            if self.input_sender:
+                return utils.get_peer_id(self._input_sender)
+
         @property
         def text(self):
             """
diff --git a/telethon/events/userupdate.py b/telethon/events/userupdate.py
index 7f87cde5..4bd6b446 100644
--- a/telethon/events/userupdate.py
+++ b/telethon/events/userupdate.py
@@ -151,3 +151,13 @@ class UserUpdate(EventBuilder):
         def user(self):
             """Alias around the chat (conversation)."""
             return self.chat
+
+        @property
+        def input_user(self):
+            """Alias around the input chat."""
+            return self.input_chat
+
+        @property
+        def user_id(self):
+            """Alias around `chat_id`."""
+            return self.chat_id