Hi - I did not do this or look into it, but I think you would have to book ahead of time. I would try looking at their website. Sorry this isn't more helpful.

I can not confirm the unveiling. Have you tired to find times on their web site? In my experience, any service they hold and you participate in will be etched into your memory for ever. Please allow for extra time to arrive and park and walk into the compound.

I recently visited & although I can’t elaborate on the veiling, I found it difficult to view closely as mid pm was mass, so there was no access at this time.

Our private tour guide set it up. I do think you can contact the church and set it up directly. On the day we went we waited for another family to join our group but they did not show up for that reason I would encourage you to call church and request a priest that speaks the language you would like. Also check online.

Yes

The Madonna is revealed during a Mass, which is always absolutely packed to the rafters. But on one of the monk/priest led tours, you just bypass the Mass and crowd, and walk past the icon. I can’t imagine a requirement to do so on your knees - that would take until the next day for the crowd to pass by. It is possible that some of the more devout pilgrims may complete the last part of their journey on their knees, but in the church itself, that would be almost impossible.

Costs in time : 3 houres Costs in money : except for one part ( +- 6 euros ) , everything is free .

There are various unveiling and veiling times during the day. For our visit it was unveiled at 6 am, veiled at noon, unveiled at 1pm and veiled at 9 pm. It is not a quick process each time. Prayers involved so actual times vary.

Thank you..... I managed to get a booking using the E center on their website.