Took over a rural hotel in Menorca in October which was end of season for them where they would have been closed anyway. Including photographer, rooms, food, DJ, band, cars etc it cost us about £8k all in - we paid for the rooms, all our 40 guests had to do was get a flight and turn up for the weekend. We restricted it to family and close friends only and we took the family out for a pre-wedding evening meal also.
Totally relaxed weekend, which everyone loved - we were lucky with weather and it was 28C+ for the week. Most of our guests either stayed or booked another hotel and stayed the rest of the week for a short holiday.
Caveats - my wife is Spanish and speaks Catalan also - you really need to speak the language or find someone to help as organising things is rarely straightforward even with fluency