Expo is small but there were no lines for bib pick-up, don’t forget to print your confirmation letter. T-shirts run small so if you do this half marathon, check the size before picking up the shirt (they have like a counter with all sizes to try them on).
I was staying not so far away from the start so we jogged from there to warm up. I couldn't believe that there were no lines for the toilets at the Stadium, it was great! A bit crowded at the beginning, not too many corrals and the release was in only one wave.
Water stops every 5 km, some fruit and salts. Elevation is not difficult as you have only some bridges but the rest is pretty flat. Some streets are narrow and the change of pavement might be tricky in the rain, I didn't have any issue though.
In the course, you see: Stadium, Porta Nuova, some churches and bridges, the Castle, and other historic landmarks. In the past you could you inside the Arena right before the finish line, this year there was something going on inside so we went around the Arena.
We didn't check a bag so I can't tell my experience about that part, we also missed the pasta party after the race.
There was a 5k and the Duo Half Marathon, where you can do the half in two, switching places mid-race.