The HALLÅ STEAM project was launched in 2018 as a collaboration between science historians and education experts. The project’s goal is to support Swedish learning among elementary and lower-secondary school Finnish students. In the HALLÅ STEAM framework, we already organized several Swedish-speaking STEAM Learning Days across Finland and met with hundreds of students and dozens of teachers. Our program still continues and offers various STEAM (Science, Technology, Engineering, Arts, and Mathematics) activities, partially based on historical connections between art and sciences in the Swedish-Finnish context. The Learning Day consists of drama pedagogy, story-telling, and role-playing components and experiential learning workshops for the students, and practical training for the teachers about multidisciplinary STEAM learning in a multilingual context. The project is supposed to develop Finnish primary and lower-secondary school students' attitudes towards Swedish learning as well by using the language in different contexts than in a traditional Swedish class. The presentation will summarize the details of the project in reflection on a few research results from the field.