You can write this experience in your personal experience or hobby. Emphasize your participation and contribution, such as participating in the promotion activities organized by a company, assisting in publicity and sales, showing good communication skills and teamwork spirit, constantly learning and adjusting strategies during the activities, and achieving good results. This experience can further understand the marketing industry and cultivate sales skills and resilience. You can further expand the relevant content of the experience, such as introducing the scale, goal, success index of the promotion, and the specific skills and experiences learned in the activity, so as to more fully show your personal experience and ability and show your enthusiasm and diligence to recruiters.