Any farrier worth their salt would know this and trim accordingly. Also, a barn full of lame barefoot horses that were all previously sound should be setting off alarm bells. Feed and farrier would be what I would blame, not wet ground.
My farrier always asks before he does the horses what their "schedule" for riding and showing is and any other fun tidbits about the horse. If he is doing a horse under a week before an event he is very careful and with new horses is also careful until he finds their optimum"
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Soft outside and hard indoors = sore feet. Farrier or feed doesn't play into it. We have one mare with soft feet. If it's wet for days - she gets tender.