International Invitational Poster Exhibition of Life Tree with the Theme of Environment was started by Hamid Nejati and Dariush Allahyari in 2018. The guests are 120 artists in this exhibition, including 62 designers from Iran and 58 designers from countries such as Mexico, Azerbaijan, Turkey, Slovakia, Canada, Poland, USA, South Korea, Ecuador, Argentina, Russia, Denmark, Italy, Germany, Ukraine, Indonesia, Hungary, Belarus, China, Portugal, and Chile.