Here as reference. I will do this for other cities hopefully.
https://upload.wikimedia.org/wikiped...lPorto.svg.png
https://pt.wikipedia.org/wiki/Porto
Demonstration
https://www.youtube.com/watch?v=cprvaXTg1Bk
Student Parade
https://www.youtube.com/watch?v=Fvs5AYlgzuk
City Hall as of 2019:
https://www.dinheirovivo.pt/wp-conte.../ng3297321.jpg
https://pontosdevista.pt/static/uplo...ipe-araujo.jpg
http://portoonossomovimento.pt/wp-co...ina_Araujo.jpg
https://i.ytimg.com/vi/8uZ-UcVSGtw/maxresdefault.jpg
http://www.porto.pt/assets/misc/img/...ivo_4_9_01.JPG
http://ruimoreira2017.pt/wp-content/...el-300x390.jpg
https://static.globalnoticias.pt/jn/...20180419181800
https://porto.ps.pt/wp-content/uploa...3-1024x683.png
http://www.young-adulllt.eu/images/p...ime=1507645874
http://valsousa.tv/wp-content/upload...066896_n-1.jpg
https://i.ytimg.com/vi/qdpCS08eTck/maxresdefault.jpg
https://www.viva-porto.pt/wp-content...ro_almeida.jpg
http://www.correiodoporto.pt/wp-cont...DO-Ilda-PT.jpg
Music bands:
Azeitonas
https://www.noticiasmagazine.pt/file...7-1024x657.jpg
Ornatos Violeta
https://barlavento.pt/wp-content/upl...do-975x596.jpg
GNR
https://imagens.publicocdn.com/image...type=JPG&w=823
Blind Zero
https://i1.wp.com/espalhafactos.com/...59%2C500&ssl=1
Musicians
Adriano Correia de Oliveira
https://www.louielouie.pt/pub/media/...ira_trocva.jpg
Rui Veloso
https://cdn.cmjornal.pt/images/2018-..._53_720250.jpg
Pedro Abrunhosa
https://imagens.publicocdn.com/image...type=JPG&w=823
Filipe Pinto
https://www.vip.pt/sites/default/fil...?itok=Y1SIfZba
José Mario Branco
https://media-manager.noticiasaominu...34.jpg?&w=1920
Sergio Godinho
https://static.globalnoticias.pt/sto.../ng8057970.jpg