...stating your zone, telephone number, “Sado” or “no Sado” and slot it...

I'm not familiar with what your passports look like, but I would either say:

Those who wish to attend the August pilgrimage, please prepare a photocopy of your passport showing your zone, telephone number, “Sado” or “no Sado” and slot it in the Pilgrimage Box.

-or-

Those who wish to attend the August pilgrimage, please prepare a photocopy of your passport, state your zone, telephone number, “Sado” or “no Sado” and slot it in the Pilgrimage Box.

It depends on whether the information requested in on the passport or if you are providing it separately.

Thanks, engineer.