Time-Domain Photometry of Protostars at Far-Infrared and Submillimeter Wavelengths

The majority of the main-sequence mass of a star is assembled in the protostellar phase, where a forming star is embedded in an infalling envelope and encircled by a protoplanetary disk. We discuss the progress that would be enabled with far-infrared and submillimeter programs to probe protostellar accretion variability in the nearest kiloparsec.