The usual parade in which up to 3,000 kids participate in has been canceled again for 2021 and replaced with a digital “Halloween mobile walk rally”.
The rally (the name for a Japanese activity in which you collect stamps) is open to costumed children, 12 years or under with a mobile phone. Participants check-in at various check-in points around Roppongi Hills using a dedicated app. If they get three or more, they receive a pack of sweets.
To prevent the spread of COVID-19, many events have been canceled. Always check official sites before heading to an event.