Flight
Inverness has multiple flights, trains, buses etc in and out every day. We would recommend flying up Friday afternoon, and then leaving Sunday afternoon. It's an easy half hour drive from the airport to the venue, by taxi or rental car. If you have a bit of time to spare on Friday evening, Saturday morning or Sunday (if you're not too hungover..), a car might be nice for exploring the Highland surrounds (Nessie sighting, etc).
Rental Car
For those who would like to share taxis or rental cars, we have put together a spreadsheet to help you to liaise with other guests travelling at the same time as you (see link below). Rental cars are probably easiest to book through various comparison sites, and for taxis, we would recommend Inverness Taxis (01463 222 222) which should be ~£50 for the half hour trip from / to the airport.