diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 55606cb2..738261fe 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -69,7 +69,7 @@ jobs:
       - uses: isort/isort-action@master
         with:
           requirementsFiles: "requirements.txt requirements.dev.txt"
-      - uses: psf/black@stable
+      - uses: psf/black@23.11.0
       - name: Comment if linting failed
         if: failure()
         uses: thollander/actions-comment-pull-request@v2
diff --git a/calendar_backend/models/__init__.py b/calendar_backend/models/__init__.py
index 19f25799..b9c35e30 100644
--- a/calendar_backend/models/__init__.py
+++ b/calendar_backend/models/__init__.py
@@ -8,6 +8,8 @@
     EventsGroups,
     EventsLecturers,
     EventsRooms,
+    EventUser,
+    EventUserStatus,
     Group,
     Lecturer,
     Room,
@@ -27,4 +29,6 @@
     "EventsRooms",
     "ApproveStatuses",
     "EventsGroups",
+    "EventUser",
+    "EventUserStatus",
 ]
diff --git a/calendar_backend/models/db.py b/calendar_backend/models/db.py
index 47f4ceac..62f8318c 100644
--- a/calendar_backend/models/db.py
+++ b/calendar_backend/models/db.py
@@ -14,6 +14,13 @@
 from .base import ApproveStatuses, BaseDbModel
 
 
+class EventUserStatus(str, Enum):
+    NO_STATUS: str = "no_status"
+    GOING: str = "going"
+    NOT_GOING: str = "not_going"
+    ATTENDED: str = "attended"
+
+
 class Credentials(BaseDbModel):
     """User credentials"""
 
@@ -211,3 +218,14 @@ class CommentEvent(BaseDbModel):
         foreign_keys="CommentEvent.event_id",
         primaryjoin="and_(Event.id==CommentEvent.event_id, not_(Event.is_deleted))",
     )
+
+
+class EventUser(BaseDbModel):
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    event_id: Mapped[int] = mapped_column(Integer, ForeignKey("event.id"), nullable=False)
+    user_id: Mapped[int] = mapped_column(Integer, nullable=False)
+    status: Mapped[EventUserStatus] = mapped_column(DbEnum(EventUserStatus, native_enum=False), nullable=False)
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime, nullable=False, default=datetime.utcnow, onupdate=datetime.utcnow
+    )
+    is_deleted: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
diff --git a/calendar_backend/routes/base.py b/calendar_backend/routes/base.py
index 5cdd7cdf..0706363d 100644
--- a/calendar_backend/routes/base.py
+++ b/calendar_backend/routes/base.py
@@ -20,6 +20,7 @@
 from .event.comment import router as event_comment_router
 from .event.comment_review import router as event_comment_review_router
 from .event.event import router as event_router
+from .event.user_event import router as user_event_router
 from .group.group import router as group_router
 from .lecturer.comment import router as lecturer_comment_router
 from .lecturer.comment_review import router as lecturer_comment_review_router
@@ -128,3 +129,4 @@ async def dispatch(self, request: Request, call_next: RequestResponseEndpoint) -
 app.include_router(event_router)
 app.include_router(event_comment_router)
 app.include_router(event_comment_review_router)
+app.include_router(user_event_router)
diff --git a/calendar_backend/routes/event/event.py b/calendar_backend/routes/event/event.py
index 181cae1d..1af85121 100644
--- a/calendar_backend/routes/event/event.py
+++ b/calendar_backend/routes/event/event.py
@@ -1,5 +1,5 @@
 import logging
-from datetime import date, datetime, timedelta
+from datetime import date, timedelta
 from typing import Literal
 
 from auth_lib.fastapi import UnionAuth
diff --git a/calendar_backend/routes/event/user_event.py b/calendar_backend/routes/event/user_event.py
new file mode 100644
index 00000000..b0b17fc3
--- /dev/null
+++ b/calendar_backend/routes/event/user_event.py
@@ -0,0 +1,42 @@
+from auth_lib.fastapi import UnionAuth
+from fastapi import APIRouter, Depends, Query
+from fastapi_sqlalchemy import db
+
+from calendar_backend.models import Event, EventUser
+from calendar_backend.routes.models.visit import VisitResponse
+
+
+router = APIRouter(prefix="/event", tags=["Event: Visit"])
+
+
+@router.post("/{event_id}/visit", response_model=VisitResponse)
+async def set_event_visit_status(
+    event_id: int,
+    auth: dict = Depends(UnionAuth()),
+    visit: str = Query(enum=["no_status", "going", "not_going", "attended"], default="no_status"),
+) -> VisitResponse:
+    """
+    Отметить посещение мероприятия для текущего пользователя.
+    """
+    user_id = auth.get('id')
+
+    Event.get(event_id, with_deleted=False, session=db.session)
+
+    existing = (
+        EventUser.get_all(session=db.session)
+        .filter(EventUser.event_id == event_id, EventUser.user_id == user_id)
+        .first()
+    )
+
+    if existing:
+        result = EventUser.update(existing.id, session=db.session, status=visit)
+    else:
+        result = EventUser.create(
+            session=db.session,
+            event_id=event_id,
+            user_id=user_id,
+            status=visit,
+        )
+
+    db.session.commit()
+    return VisitResponse.model_validate(result)
diff --git a/calendar_backend/routes/models/__init__.py b/calendar_backend/routes/models/__init__.py
index bd80e638..1f4f587b 100644
--- a/calendar_backend/routes/models/__init__.py
+++ b/calendar_backend/routes/models/__init__.py
@@ -14,6 +14,7 @@
     Photo,
 )
 from .room import GetListRoom, RoomEvents, RoomPatch, RoomPost
+from .visit import VisitRequest, VisitResponse
 
 
 __all__ = (
@@ -46,4 +47,6 @@
     "RoomEvents",
     "RoomPatch",
     "RoomPost",
+    "VisitRequest",
+    "VisitResponse",
 )
diff --git a/calendar_backend/routes/models/visit.py b/calendar_backend/routes/models/visit.py
new file mode 100644
index 00000000..6bd8f978
--- /dev/null
+++ b/calendar_backend/routes/models/visit.py
@@ -0,0 +1,19 @@
+import datetime
+
+from pydantic import BaseModel
+
+from calendar_backend.models import EventUserStatus
+
+
+class VisitRequest(BaseModel):
+    status: EventUserStatus
+
+
+class VisitResponse(BaseModel):
+    id: int
+    event_id: int
+    user_id: int
+    status: EventUserStatus
+    updated_at: datetime.datetime
+
+    model_config = {"from_attributes": True}
diff --git a/migrations/versions/b060027b11b3_eventuser_building.py b/migrations/versions/b060027b11b3_eventuser_building.py
new file mode 100644
index 00000000..f013c1f3
--- /dev/null
+++ b/migrations/versions/b060027b11b3_eventuser_building.py
@@ -0,0 +1,50 @@
+"""EventUser building
+
+Revision ID: b060027b11b3
+Revises: 55a049fde8f4
+Create Date: 2026-04-20 17:56:39.185374
+
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision = 'b060027b11b3'
+down_revision = '55a049fde8f4'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        'event_user',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('event_id', sa.Integer(), nullable=False),
+        sa.Column('user_id', sa.Integer(), nullable=False),
+        sa.Column(
+            'status',
+            sa.Enum('NO_STATUS', 'GOING', 'NOT_GOING', 'ATTENDED', name='eventuserstatus', native_enum=False),
+            nullable=False,
+        ),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+        sa.Column('is_deleted', sa.Boolean(), nullable=False),
+        sa.ForeignKeyConstraint(
+            ['event_id'],
+            ['event.id'],
+        ),
+        sa.PrimaryKeyConstraint('id'),
+    )
+    op.drop_constraint(op.f('lesson_group_id_fkey'), 'event', type_='foreignkey')
+    op.drop_column('event', 'group_id')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('event', sa.Column('group_id', sa.INTEGER(), autoincrement=False, nullable=True))
+    op.create_foreign_key(op.f('lesson_group_id_fkey'), 'event', 'group', ['group_id'], ['id'])
+    op.drop_table('event_user')
+    # ### end Alembic commands ###
diff --git a/requirements.dev.txt b/requirements.dev.txt
index 15533c0f..b36fa3d1 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -2,6 +2,6 @@ pytest
 pytest-cov
 requests
 pytest-mock
-black
+black==23.11.0
 isort
 autoflake