Dear friends, This is the first announcement of the School Geometry and scaling of random structures at Buenos Aires July 16 to 27, 2018. This is a CIMPA School, the X Escuela Santaló and an ICM Rio Satellite workshop, There will be 4-hour courses by Amine Asselah, Christophe Garban, Milton Jara, Claudio Landim, Jason Miller and Perla Sousi and around 35 40-minute talks. More information and registration: http://mate.dm.uba.ar/~probab/cimpaBA2018/ Deadline for applying for support: March 11, 2018. Thank you in advance for passing this announcement forward to your Phd students, post-docs and colleagues. Best regards, Amine Asselah and Pablo Ferrari