For reunions it is also usually possible to camp onsite; check with IHS.
Waldamar airbnb Mark Frost in August 2023: a very high standard & highly recommended converted barge - hosts Alex & Sue are very welcoming - about £120 for a double room per night including full breakfast - can sleep a total of 12 in 5 bedrooms and they are considering letting out the entire boat to groups in the future - book via AirBnb or phone 07854 570404 (7 photos here: more on their website left)
The Shipwreck Loft (at Shotley)
Chimneys B and B, Holbrook  
The Red Lion, Chelmondiston  
Bridge Guest House - Shotley side of Ipswich near Marina

Chris Snuggs in August 2023: simple, clean, unpretentious, good value, nice people, close to station and bus stop to Shotley

The Shipwright's Arms on Wherstead Road  
Premier Inn Ipswich South (just after Freston, en route into Ipswich)  
Easy Hotel (Ipswich town centre – 5 miles from Woolverstone)  
The Salthouse (on Ipswich waterfront)