Onsite camping is often permitted for open events, however for a bit more comfort consider one of the following options:
Travelodge Lowton https://www.travelodge.co.uk/hotels/489/Warrington-Lowton-hotel
Holiday Inn Express, Leigh https://www.hiexpressleigh.co.uk
To view all local options https://www.google.com/search?q=hotels+near+Leigh+and+lowton+sailing+club
If you need any vital boat bits, visit https://www.1stmark.co.uk/ who are just 10 minutes away.