Q: We are preparing for a Eucharistic Procession that will be about 6 miles in length and 2-3 hours long. Is it appropriate for a Deacon to carry the monstrance in the event of not having enough Priests?
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A: HCWEMOM 105 and 106 just mention a priest. However, those numbers seem not to envision a multi-hour procession. I think no. 101 would come to your rescue, as it allows the diocesan bishop to make judgments about the arrangements of a procession. Having deacons assist seems quite reasonable to me. Perhaps it would to him as well.