Not sure what you mean by 'participate'? I mean, what school do you attend? Are you wanting to just basically observe in a hospital? Or in a specific area? You are pretty vague about what you'd like to do. I am a medical student of the American University of the Caribbean in Sint Maarten, currently doing 3rd year clinicals in Ireland, as part of our official clinical agreement with Waterford Regional Hospital.
However, just coming in informally and observing for a month might be a bit tricky with issues like patient confidentiality, insurance, etc. If you were more clear about what you are looking for, maybe we would know how to help.
Good luck!