Amidst escalated tensions between India and Pakistan, veteran actresses from Pakistan have urged cross-border peace using a rap number.
President Ashraf Ghani hopes to showcase unity at the four-day meeting — known as Loya Jirga — that brings together politicians, tribal elders and others.
This week's "loya jirga", or grand assembly, saw more than 3,000 religious and tribal leaders, politicians and representatives from across the country gather under tight security to discuss the possibility of peace.
It was not immediately clear whether the US-Taliban talks will resume and when on ending nearly 18 years of fighting.
"Iran remains open to dialogue with its neighbours and we announce our readiness to participate in any complementary work that is in the interest of the region," Zarif wrote in Arabic on Twitter.
Geir Pedersen told a UN Security Council meeting on the sidelines of the annual gathering of world leaders at the General Assembly that the committee alone cannot resolve the conflict, saying that actions to de-escalate violence and move toward a nationwide cease-fire "are absolutely essential."
The Taliban delegation led by Mullah Abdul Ghani Baradar, one of the group's founders, was due to discuss "important issues" with Pakistani officials in the capital, Islamabad, Taliban spokesman Suhail Shaheen said on Twitter.
President Ashraf Ghani spoke during the Muslim holiday Eid Al Adha and as US and Taliban negotiators continue their work in the Gulf nation of Qatar, where the insurgents have a political office.
Washington signed a landmark deal with the Taliban in February that promised the withdrawal of US and foreign troops from Afghanistan by next summer, provided the militants start talks with Kabul and adhere to other guarantees.