The city hosts "Big Sioux River Days" over Labor Day Weekend.

Entity and relation annotations:
id: 0
type: entity
value: text: "Big Sioux River Days"
labels: <Event>
id: 1
type: entity
value: text: Labor Day Weekend
labels: <Date>
type: relation
to_id: 1
labels: Event:Occurs_on:Date
from_id: 0