I only spotted this post because I was logged out at the time. I'm not sure how active MUA's are on here at the moment. To answer you question you need to create a casting call. That or search for photographers in the area you are going to and sent a short pm to let them know you are available. You may get the odd perennial griper moaning about being 'spammed' but ignore them. This is a networking site at the end of the day and that's what you are seeking to do.
Cannot remember if you have to be a paid member to ask for payment on the Casting calls. Apologies if that is the case as with the site so quiet at the moment that's slightly daft. People need all the encouragement they can to be active right now