Since the Covid-19 pandemic broke out, almost all over the world have stopped indoor events. Because indoor gathering makes it easier for the corona virus to spread. Even studying at school and working in an office is turning into studying and working from home with online system. After the pandemic subsided, governments in each country also set health protocol rules for various activities. Even though the pandemic has subsided, indoor activities are still under strict supervision. Therefore, some event organizers recommend outdoor events. Holding outdoor event is good because people gather at wider area so there will be a better air circulation. Smooth air circulation certainly does not store viruses.…