In its 31st year, the event’s official Japanese title is “Sendai Hikari no Pajento” which doesn’t mention anything about starlight.
If it’s not obvious from the photo, this event is Sendai’s main winter illumination event.
The venue for the light-up is the Zelkova lined boulevards of Aoba Dori and Jouzenji Dori right in the center of Sendai. A good starting point is Kotodai Station at the eastern end of Jouzenji Dori.
The light-up is on daily from 5:30pm until 11pm. On the last day, the lights will stay on until midnight.