diff --git a/fbchat/__init__.py b/fbchat/__init__.py
index 13dd54e..6c769d9 100644
--- a/fbchat/__init__.py
+++ b/fbchat/__init__.py
@@ -42,6 +42,8 @@ from ._quick_reply import (
 from ._poll import Poll, PollOption
 from ._plan import GuestStatus, Plan, PlanData
 
+from ._event_common import Event, UnknownEvent, ThreadEvent
+
 from ._client import Client
 
 __title__ = "fbchat"
diff --git a/fbchat/_client.py b/fbchat/_client.py
index f3c3d05..eee243a 100644
--- a/fbchat/_client.py
+++ b/fbchat/_client.py
@@ -13,6 +13,7 @@ from . import (
     _group,
     _thread,
     _message,
+    _event_common,
 )
 
 from ._thread import ThreadLocation
@@ -1194,6 +1195,10 @@ class Client:
     EVENTS
     """
 
+    def on_event(self, event: _event_common.Event):
+        """Called when the client is listening, and an event happens."""
+        log.info("Got event: %s", event)
+
     def on_message(
         self,
         mid=None,
diff --git a/fbchat/_event_common.py b/fbchat/_event_common.py
new file mode 100644
index 0000000..5da21c4
--- /dev/null
+++ b/fbchat/_event_common.py
@@ -0,0 +1,50 @@
+import attr
+import abc
+from ._core import kw_only
+from . import _exception, _thread, _group, _user, _message
+
+#: Default attrs settings for events
+attrs_event = attr.s(slots=True, kw_only=kw_only, frozen=True)
+
+
+@attrs_event
+class Event(metaclass=abc.ABCMeta):
+    """Base class for all events."""
+
+    @classmethod
+    @abc.abstractmethod
+    def _parse(cls, session, data):
+        raise NotImplementedError
+
+
+@attrs_event
+class UnknownEvent(Event):
+    """Represent an unknown event."""
+
+    #: The unknown data. This cannot be relied on, it's only for debugging purposes.
+    data = attr.ib()
+
+    @classmethod
+    def _parse(cls, session, data):
+        raise NotImplementedError
+
+
+@attrs_event
+class ThreadEvent(Event):
+    """Represent an event that was done by a user/page in a thread."""
+
+    #: The person who did the action
+    author = attr.ib(type=_user.User)  # Or Union[User, Page]?
+    #: Thread that the action was done in
+    thread = attr.ib(type=_thread.ThreadABC)
+
+    @staticmethod
+    def _get_thread(session, data):
+        # TODO: Handle pages? Is it even possible?
+        key = data["threadKey"]
+
+        if "threadFbId" in key:
+            return _group.Group(session=session, id=str(key["threadFbId"]))
+        elif "otherUserFbId" in key:
+            return _user.User(session=session, id=str(key["otherUserFbId"]))
+        raise _exception.ParseError("Could not find thread data", data=data)
diff --git a/tests/test_event_common.py b/tests/test_event_common.py
new file mode 100644
index 0000000..2b462f9
--- /dev/null
+++ b/tests/test_event_common.py
@@ -0,0 +1,57 @@
+import pytest
+from fbchat import Group, User, ParseError, ThreadEvent
+
+
+def test_thread_event_get_thread_group1(session):
+    data = {
+        "threadKey": {"threadFbId": 1234},
+        "messageId": "mid.$gAAT4Sw1WSGh14A3MOFvrsiDvr3Yc",
+        "offlineThreadingId": "6623583531508397596",
+        "actorFbId": 4321,
+        "timestamp": 1500000000000,
+        "tags": [
+            "inbox",
+            "sent",
+            "tq",
+            "blindly_apply_message_folder",
+            "source:messenger:web",
+        ],
+    }
+    assert Group(session=session, id="1234") == ThreadEvent._get_thread(session, data)
+
+
+def test_thread_event_get_thread_group2(session):
+    data = {
+        "actorFbId": "4321",
+        "folderId": {"systemFolderId": "INBOX"},
+        "messageId": "mid.$XYZ",
+        "offlineThreadingId": "112233445566",
+        "skipBumpThread": False,
+        "tags": ["source:messenger:web"],
+        "threadKey": {"threadFbId": "1234"},
+        "threadReadStateEffect": "KEEP_AS_IS",
+        "timestamp": "1500000000000",
+    }
+    assert Group(session=session, id="1234") == ThreadEvent._get_thread(session, data)
+
+
+def test_thread_event_get_thread_user(session):
+    data = {
+        "actorFbId": "4321",
+        "folderId": {"systemFolderId": "INBOX"},
+        "messageId": "mid.$XYZ",
+        "offlineThreadingId": "112233445566",
+        "skipBumpThread": False,
+        "skipSnippetUpdate": False,
+        "tags": ["source:messenger:web"],
+        "threadKey": {"otherUserFbId": "1234"},
+        "threadReadStateEffect": "KEEP_AS_IS",
+        "timestamp": "1500000000000",
+    }
+    assert User(session=session, id="1234") == ThreadEvent._get_thread(session, data)
+
+
+def test_thread_event_get_thread_unknown(session):
+    data = {"threadKey": {"abc": "1234"}}
+    with pytest.raises(ParseError, match="Could not find thread data"):
+        ThreadEvent._get_thread(session, data)