I was very pleased to receive your letter. As requested, I enclose some advice about visiting Milan.
There are lots of good hotels near the Fiera and I recommend the Hotel Wagner; it is about a ten-minute walk from the trade fair and also has the metro and train connections. The public transport system here is quite reliable and I do not think you need to hire a car; the traffic in Milan can be a bit chaotic.
Finding somewhere to eat in the evening should be easy. There are plenty of restaurants and pizzerias near the hotel. My favourite is Nove Cento, which serves excellent seafood pasta.
It is difficult to know what to recommend for sightseeing as the city has so much to offer. If you are interested in art, then the world famous ‘Last Supper' by Leonardo da Vinci is a short train ride from the hotel or you could visit the Brera art gallery. There is also the Duomo, Milan's huge gothic cathedral. If you are interested in football, there should be midweek match featuring either AC or Inter Milan. Alternatively, you could visit the fashion area around via Montenapoleone.
Thank you for inviting me for a meal one evening during you stay. I would be very happy to accept.
I look forward to hearing from you nearer the time. We can then make the arrangements for where and when we are going to meet.