There are direct train services from Manchester Airport to Sheffield city centre (about one hour and 10 minutes). You can also arrive at Sheffield using the Doncaster Sheffield Airport, the East Midlands Airport, the Leeds Bradford Airport, and the Birmingham Airport. There are also frequency train services from London to Sheffield (about 2 hours), if you arrive from the Heathrow Airport or other London airports or by train from mainland Europe. You can book the train tickets from London to Sheffield at a discounted rate using the Discounted Rail Travel Booking Form for attending the workshop.
Please go to the official Welcome to Sheffield website for detailed information.
Information about how to get to the University of Sheffield can be found at the Information for Visitors website of the university.