Attacks targeting mainly Iraq's Shi'ite community have left some 40 dead.
The deadliest attacks on October 27 took place evening in the Shi'ite neighborhood of Baghdad's Sadr City.
Police say a car packed with explosives blew up near a market, killing 12 and wounding 27.
A short time later, a bomb went off at a bus station in Sadr City, killing 10 and wounding 31.
Earlier in the day, a bomb exploded near playground equipment set up for celebrations to mark the four-day Eid al-Adha celebrations.
That attack in Baghdad's eastern neighborhood of Bawiya killed eight people, according to police, including four children. Another 24 were injured.
Elsewhere, a bomb attached to a bus carrying Iranian Shi'ite pilgrims killed five people and wounded nine.
Violence is down in Iraq from its peak in 2006-08, when communal bloodshed left tens of thousands dead, but deadly attacks against security forces and Shi'ite pilgrims remain common.
Based on reporting by AFP, AP, and Reuters