Where to stay
The only hotel in the centre of Havant is The Bear. 5 minutes from the station and right in the middle of the main festival venues. The Bear offers free car parking and has a restaurant. Next nearest hotels are The Brookfield (1.5 miles on the way to Emsworth) which has similar facilities to the Bear and is, arguably, in slightly better decorative order and The Langstone, which is sited next to Northey Marina just over the bridge on Hayling Island (2 miles). The Langstone is more up-market and also offers a full leisure suite. Here are their web sites:
All of these establishments have an individual character.
There are a large number of standard clone hotels plus some more independents in the general area - try searching TripAdvisor (www.tripadvisor.co.uk) for Portsmouth, Emsworth or Hayling. This useful site also includes some B&Bs; and self-catering locations.