Your duties would include not only taking several photos of each person (to choose a good one from), but also editing them (cropping, getting the exposure and colour right, and eliminating red eye), and entering them as galleries in the open mic website and Facebook page.
What would you earn for all this work? The excitement of being an integral part of the local poetry scene, meeting people, taking part in decision making as a member of the London Open Mic organizing committee, having your own blog on the well-read London Open Mic website if you want one, and getting a good letter of reference if you should need it.
Contact Stan at burfield@live.com