WiOpt 2021 Goes Virtual: Because of the significant statutory lockdowns/travel restrictions in-place due to COVID-19 and its new Delta variant, it is still unclear when the situation will return back to normal. Therefore, the organizing committee has decided that WiOpt 2021 will be held as a virtual (online) conference during Oct. 18-21, 2021. We are going to announce more details of the virtual event soon, including information and instructions on how to prepare for a virtual presentation. The organizing committee will endeavor to ensure high quality of the conference program and excellent experience of conference authors and attendees. Thank you for your understanding and support! Stay safe and healthy!