There is an International Friendship Day started in the Republic of Paraguay after the Chaco War between Paraguay and Bolivia I believe it is celebrated on the th of July  There is also the Dia del Amigo and the Dia do Amigo celebrated in many South American countries including Brazil  Im just not sure what day they are celebrated  The Dia Internacional de la Amistad in Paraguay is one of their most important holidays in fact many Paraguayans have trouble believing that it is not celebrated elsewhere  People go to lunch with colleagues buy their friends small gifts and call or text everyone in their circle