Background The significant challenge in adolescent and young adult therapy lies in the fact that research in this field does not provide many clinical indications. This study addresses domains contributing to the establishment and sustenance of engagement, satisfaction, and progress among adolescents and young adults in their treatment by delving into the impact of events that, from the perspective of clients, have positively influenced their therapeutic process. Methods Employing a qualitative research approach, we conducted semi-structured interviews with 13 adolescents and young adults undergoing therapy, recounting positive and constructive events during their treatment. Results A structured thematic analysis revealed six primary domains of positive events: events linked to the management of the setting, events shaping the definition of therapy goals, occurrences tied to the therapist’s active role, collaborative events between therapists and clients, and events associated with both clients’ external and internal worlds. Conclusions The findings suggest that working with adolescents shares similarities with psychotherapy involving adult clients but demands specific attention to adolescents and young adults’ families, surrounding environment, and rapidly changing needs.