Is it prescribed in Islam to give a speech or exhortation at the graveside?

No File Exists
Check below answers in case you are looking for other related questions:
The lahd (niche) and shaqq (trench) in the grave
Shrouding the martyr

No File Exists
Related Answers:
If one misses some of the takbeers of the funeral prayer
When a person dies and the funeral prayer is not offered for him
Ghusl for deceased who is burned
The lahd (niche) and shaqq (trench) in the grave
Shrouding the martyr

Recommended answers for you:
Wants to marry Christian woman
Coping with wet dreams
Colours which are encouraged (mustahabb), disliked (makrooh) and forbidden (haraam) in men’s and women’s clothing
Responding to a kaafir when he says salaam to a Muslim
Thanking Allah for His Many Blessings