Why would the abolitionists want to photograph of their convention?

Abolitionists likely wanted to photograph their convention to document the movement's progress and unity, capturing the faces and voices of those committed to ending slavery. Photography would serve as a powerful tool for advocacy, helping to spread their message and garner support by visually representing the diverse coalition of individuals involved in the cause. Additionally, images could be used in publications and lectures to inspire others and raise awareness about the injustices of slavery.