Cambridge can be readily accessed by both rail or road and there are good connections to the main London airports.
The historic City centre can be rather a nightmare for cars and parking but Fitzwilliam College is located close to the western edge of the city and easily accessed via two of the main routes in and out of Cambridge (Madingley Road and Huntingdon Road).

Arriving by air
The closest major London airports are Stansted and Luton, but there are also Cambridge connections with the two larger London airports, Gatwick and Heathrow.
There are coach services (National Express services 727 and 787) connecting all four airports to Cambridge.
There are also train links direct from Stansted to Cambridge and, via London main line stations (Kings Cross and Liverpool Station) and London Underground from Heathrow and Gatwick
The Cambridge airport buses (727 and 787) all terminate beside Parkers Piece a two minute walk from the Bus Station where there is a taxi rank. It is a 10 minute taxi ride from there to the reunion venue.

Arriving by rail
The Cambridge Railway Station is centrally located and is around 10 minutes by taxi from Fitwilliam College. There is a taxi rank directly outside the station entrance. There are nationwide rail connections to Cambridge mainly via London but there is also a cross country link via Peterborough and Ely.

Arriving by car
The main entrance (used by taxis) and Porters Lodge for Fitzwilliam College is located on Storey’s Way but the small car park there is not for public use.  The main parking for those coming by car is accessed from Huntingdon Road (A3107) at the rear of the College. There is an entrance (North Gate) to the College grounds from the car park.  Access is by ringing a buzzer to alert the Porters Lodge and then talking to the duty porter.  Late arrivals should be aware that the night porter may be doing his rounds and not immediately respond to the buzzer.

Huntingdon Road connects to the A14 and A1 whilst Madingley Road connects to the M11 and the A1.
The pdf link below shows the main road routes into Cambridge and the location of Fitzwilliam College.