Considering that many students are exposed to machinery and A.I. for the first time. On November 13 and 14 2021, STEM PLUS has host a Fun Day for two consecutive days for participating students and teachers. During it, students from different schools who are preparing for the competition can share with each other their knowledge and experience of learning and preparation. Experts are also present at the venue to provide technical support and advices. The host has also provided a 1:1 ratio track for participating students to practice and get well prepared before the Final.