I understand that work on platform 2 to bring it up to normal height is due to start on June 1st.
According to recent additional page on Peak Rail website
http://www.peakrail.co.uk/eventinfo.html, Matlock station extension opening + inaugural steam service will take place on Sat 2nd July.
Unlike EVR, the Peak Rail timetable doesn't easily connect with the EMT as trains are every 1hr 16min - but there's always Bill Hudson books to spend a bit of time in.