Here's an idea that might look appealing for those who are strapped for cash.
Ryanair flies to Orio al Serio (BGY), 50km from Milan, from several countries. For the relevant dates (touchdown on Friday in the morning or afternoon, return on Sunday anytime) the fares range from 18 euros from Frankfurt to 97 euros from Tampere, including taxes.
If a party of 4 or 5 travellers can be arranged, a high-end rental car can be had for the whole weekend - say 2pm on Friday to 2pm on Saturday - for 25 to 35 euros each, all included. If the group is larger, the price goes further down, either for a minivan or two cars.
Where sleeping options are concerned, I would certainly suggest to book a hotel close to the airport for the Saturday: at the moment, HRS international has double rooms in a good four-star hotel for 65 euros (the room, not per head). If you have an early morning flight, it's very convenient; if you have an afternoon flight, you can visit Bergamo, which is a very pretty place. Not to mention that staying in the area on Saturday gives the opportunity to have dinner at a good local restaurant in the countryside, with very reasonable expense and very high quality of the fare.
On Friday, things would be slightly trickier, as I doubt that one wants to take a 50km drive after the show and the after-show party. Prices in Milan, however, are terrible. The less embarassing deal is probably a Best Western hotel about 2 km from the venue (double room at 95 euros), and there are more similar options in a 5-km radius.
To sum up: if a party of 5 people can be arranged, the per capita cost of the trip - assuming a very generous 150 euros for in situ expenses, such as show ticket/food/drinks/merch/fuel/etc - would clock in at somewhere between 300 and 400 euros depending on how good Ryanair decides to be to you. This includes: travel from/to your local airport (but not to/from your city to the airport), 1 night in Milan, 1 night in Bergamo, gig attendance, eating and drinking, and a bit of fun. I say it's not too bad.
Please let me know if 5 such people are actually there and would like to take a look at this solution (I'm not in the 5, as I will be coming but I guess that I will be seeing my family in Torino first - what I can do is meeting you at BGY when you land, with rahvin if he can take the Friday off). If you think you have friends who are interested in coming too etc, we'll think of larger-scale organization via a facebook group.
What I ask is that you let me know either here or privately (you have my email anyway) if you're interested by August 31st, so that any possible group booking can be negotiated in advance. I am going to be in Finland for a while and I'm not sure that I will be able to check my email or teh internets very often, but by that date I will be back already and able to let you know.