Contact the NAEMT if you are interested in going and they will set you up with a contact for your state's delegation. The actual day on the hill is meeting with as much of state's legislative staff as possible. The NAEMT has talking points for the bills that they have in and the individual delegations pitch it. My boss likes to bring a few of us line people each year to talk about what the bills mean to us on a day to day level, I'm not sure how the other states do it.