Find out if the other parishes in your area have Eucharistic Adoration. If they don’t, ask if they’d allow you to mention Adoration at your parish in their bulletins. It could encourage them to start their own adoration programs.
Besides pamphlets, brochures, etc. on Adoration itself, stock up on pamphlets and brochures on other topics of the faith and make them available during adoration.
Once it’s up and running, if you have one of those free, weekly newspapers in your area, see if you can run a notice in it as a kind of evangelization. You never know, someone who visits out of curiosity could be led eventually into the Church.
Print a short visitor’s guide, make copies, and place them at the entrance to the church in a visible place.
If you know of a priest who is available for confessions that day, ask if he could hear confessions at some point during adoration. I knew a priest who used to do this. If he says yes, advertise, advertise, advertise this in your parish bulletin, notice boards, etc.