Nafi' narrates from Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) would go to the Eid prayer ground on the day of Eid, and the people would carry a spear with him (peace and blessings be upon him). When he (peace and blessings be upon him) reached the Eid prayer ground, it would be planted in front of him (peace and blessings be upon him) so that he could take it as a sutrah (screen).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6168