import json
from datetime import datetime

def serialize_event(name: str, year: int, month: int, day: int) -> str:
    dict_ser = json.dumps({
        'name': name,
        'date': datetime(year,month,day)
    }, default=lambda d: d.isoformat() if isinstance(d, datetime) else str,
    )
    result = dict_ser.replace('\\"', '"')
    return json.loads(result)