While European countries celebrate Labor Day on May 1st, there are a number of other holidays and celebrations that vary depending on the country.
They give people a chance to take long week ends (Ponts de Mai in France, Early May and Spring Bank Holidays in the UK...).
In Brussels, a May highlight is Fete de l'Iris (Iris Festival), event is Free.
2014 edition includes first ever Brussels Food Truck Festival (May 9 through May 11) taking place in Parc Royal.
(* Please note that websites for Fete de l'Iris and Brussels Food Truck Festival are in French or Dutch, no English version...some details in English on Fete de l'Iris via Visit Brussels)