Nobody knows happy hour like the Italians. For us, happy hour generally means paying $3.50 for a beer instead of $4. For them, it means unlimited helpings of tapas-style food with the purchase of any aperitif.
This fantastic concept of happy hour (normally 6-9pm) has kept us well fed in many cities. The selection of food varies between bar to bar, some more impressive than others. Like this one in Bologna.