500N - Public liability insurance is essential in these litigation-strewn days. If you'd ever tried to obtain permission from the authorities to organise a large-scale public event, you'd know. Even the amount of the excess to be paid
per potential claim by individuals can be eye-watering. Try completing the procedure here to get a quote for a notional parade, especially when you don't know the number of attendees:
N.B. Other insurers are available.