It's a world education conference. 35,000 people had to be accomodated and I'm sure what they did was OK with the Vatican.
I bet JJP2 did the same many times on his trips being he was at events where he had to give communion to tens of thousands as well.
Make that JP2
Don't be.
Instruction Redemptionis Sacramentum[117.] Sacred vessels for containing the Body and Blood of the Lord must be made in strict conformity with the norms of tradition and of the liturgical books. The Bishops’ Conferences have the faculty to decide whether it is appropriate, once their decisions have been given the recognitio by the Apostolic See, for sacred vessels to be made of other solid materials as well. It is strictly required, however, that such materials be truly noble in the common estimation within a given region, so that honour will be given to the Lord by their use, and all risk of diminishing the doctrine of the Real Presence of Christ in the Eucharistic species in the eyes of the faithful will be avoided. Reprobated, therefore, is any practice of using for the celebration of Mass common vessels, or others lacking in quality, or devoid of all artistic merit or which are mere containers, as also other vessels made from glass, earthenware, clay, or other materials that break easily. This norm is to be applied even as regards metals and other materials that easily rust or deteriorate.
[173.] Although the gravity of a matter is to be judged in accordance with the common teaching of the Church and the norms established by her, objectively to be considered among grave matters is anything that puts at risk the validity and dignity of the Most Holy Eucharist: namely, anything that contravenes what is set out above in nn. 48-52, 56, 76-77, 79, 91-92, 94, 96, 101-102, 104, 106, 109, 111, 115, 117, 126, 131-133, 138, 153 and 168. Moreover, attention should be given to the other prescriptions of the Code of Canon Law, and especially what is laid down by canons 1364, 1369, 1373, 1376, 1380, 1384, 1385, 1386, and 1398.