I just spoke to Lynnies, and yes there are only a few powered sites left. There are also beds in the bunkhouse and some cabins left.
We are looking at holding the Presentation dinner there in the function room which has an ajoining kitchen and more room than the clubhouse if there are a good number of people coming.
It being a coastal town it cools off at night and is usually 8-10 degrees cooler than Mount Gambier on a hot day.
The boats will be parked within 120 metres from Lynnies and 50 metres north of the club. You can camp next to your boat by booking through the main council caravan park, but there are no amenities there you will have to use the clubhouse.
Get your booking in quick as this is the busy time of the year.