I think that a greater amount of specificity would help with the question. Being able to identify what exactly about imperialism you seek will be good here. The idea of "arts" in imperialism is also vague. Are you looking for themes or ideas in arts of or from imperialism ? Perhaps, you are examining art from the imperialism times to today. There has to be some level of detailing as to how this is going to work. There needs to be some clarification as to where you want this question to pursue. I think being able to refine these thoughts and think about what topic it is you want to invite collaboration would be good. This will allow you to better gauge responses in helping to create an optimal work product.