Apart from informal presentations by conference participants, there will be plenary talks by Alexei Borodin, Jennifer Chayes, Tadahisa Funaki, Dmitry Ioffe, Sarah Penington, and Makiko Sasada. The main conference will be held on March 18-20, 2021; on March 17, there will be a special set of tutorial lectures by Greg Lawler and discussions targeted at early-career researchers. We expect this conference will be supported with funds to allow reimbursement of travel expenses. Graduate students, early-career researchers, women, and members of underrepresented groups are especially encouraged to register and apply for funds. Applications will be accepted soon on the conference website, and should be received by end of January, 2021 for first consideration. SSP 2021 is currently planned to be held in-person, with suitable COVID-19 precautions, to the extent possible given the evolving public health situation. Remote conference participation options will be implemented as appropriate.