Connection between Cannes and near-by places?

If I need to be in Cannes for business and it happens that I cannot stay there because all hotels are already booked at that time, which one of the near-by towns should I choose, in order to have the best connection and easiest approach to Cannes? I am considering places it takes no more than 20-30 minutes ride to get there. Also, could you tell me how much a bus ticket costs? And how much is taking a cab?
Very important note, I would prefer a place that is connected with Cannes by bus at night as well. Are there any? I think I have been told there is only train at night, but I also heard that train stations are not very safe at that time there. I apologize if I am wrong about that, but this is what I have been told.
Thanks a lot for any information you might have.

Yes, it is during the Film Festival. And it is a single room. I just look for a clean and safe place and at the same time for a cheap price, so I am interested in 2 or 3 star hotels. I need to know which town to choose, in case I can鈥檛 find anything in Cannes.

I would stay at Mandelieu.
There are some small hotels there.
A taxi to Cannes would be about 25Euros
Or take a bus about 30 minutes

I find it a bit hard to believe that every hotel room in Cannes is booked except during the Film Festival. Is that when you'll be there?

What's your price range? I take it you need only a single...am I correct?

Hi there...
The best if you go to Cannes for the film festival, and that all the hotels are booked, is that you try to stay in a town which is along the coast... reason being that you can take the train. For example if you stay in Nice, which is 40k of Cannes, would take 25mns by train, and you have a train every 20-30mns... also you could try to stay in Antibes, which is 10mns by train as well. I would consider to take the train, coz you ll avoid traffic jams.
As the riviera is very touristic area, you ll not have any problem to find accomodations.
Good luck