Every Labor Day weekend, Brookfield hosts the Great Pershing Balloon Derby.

Entity and relation annotations:
id: 0
type: entity
value: text: Labor Day
labels: <Date>
id: 1
type: entity
value: text: Brookfield
labels: <Location>
id: 2
type: entity
value: text: the Great Pershing Balloon Derby
labels: <Event>
type: relation
to_id: 1
labels: Event:Occurs_at:Location
from_id: 2
type: relation
to_id: 0
labels: Event:Occurs_on:Date
from_id: 2