Here are two suggestions of where to stay in the nearby town of Arezzo, these have both been suggested by the wedding venue. These are only two suggestions, however there will be many other options on both AirBnb and Booking.com.
The closest airport to fly into is Florence, however Pisa and Rome are also options. The cheapest option we have found so far is to fly into Pisa, with the best option from the UK being from East Midlands or Stansted.
Once you arrive at the airport the train service runs from all three towns into Arezzo. Another option is to hire a car then you have full freedom to explore during your stay! This can also be booked through booking.com or skyskanner.
On the day of the wedding there are taxis/uber available that go between Il Palazzo and Arezzo.