Emaus, named after the biblical village ('Emmaus' in English), is a traditional Kraków odpust (indulgence) that takes place in Salwator annually on Easter Monday.
Indulgence fairs accompanying church services were once customary in Poland, but Kraków's is by far the largest and most popular, surviving without pause since at least the 16th century. Each year hundreds of families descend upon the Norbertine Monastery and its surrounding streets - specifically Kościuszki, Senatorska, Kasztelńska and Emaus - where merchants set up stalls selling traditional gingerbread hearts and candy, folk toys and souvenirs, balloons, food, shooting galleries, carousels, rides, raffles, and all sorts of merry nonsense that children particularly enjoy.
For more about Easter traditions in Poland, read our article: Easter in Kraków.