Check the top-level program here
Special issue of Optics Express and Optics Materials Express
OpEx: http://www.osapublishing.org/oe/journal/oe/feature_announce/no2019.cfm OMEx: http://www.osapublishing.org/ome/journal/ome/feature_announce/no2019.cfm
Toward NLO 2021
NLO 2021 in Maui will be announced soon, stay tuned!