Most of downtown Reykjavík will be closed off for car traffic during Menningarnótt (Culture Night). Culture Night is an annual festival, held on the last Saturday of August, which takes over downtown Reykjavík with countless happenings. Event planners encourage residents and visitors alike to acquaint themselves with the closures ahead of time.
Most of the streets will be closed from 07:00 in the morning. Buses will leave regularly from Hlemmur bus station, up Snorrabraut street and toward Hallgrímskirkja church.
The festival will celebrate local food, poetry, music, literature, sports as well as other events and happenings. The Reykjavík marathon will also take place on Saturday, so travellers, whether going by foot, bike or car, might have to respect closures along the marathon route.
Culture Night website: https://culturenight.is/