This paper describes a project-based oral activity trialled with Year 1 and Year 2 students of the Spanish Degree Programme at the University of York. The objective of the activity aimed to develop students' speaking confidence through the completion of an authentic task based on the concept of authentic assessment. This task was implemented during the academic year 2017-18 and consisted of students developing poster campaigns with a slogan and hashtag that they would subsequently justify during their presentation. The task had outstanding results as students benefited from practising a range of practical skills and reported it to be a very rewarding experience. As a result, it is intended that this activity will now be integrated in oral summative assessments for the modules in which this task was trialled. [For the complete volume, "Innovative Language Teaching and Learning at University: A Look at New Trends," see ED594807.]