John Lightfoot on John 7:14

[About the midst of the feast.] On some work-day of the feast. But was he not there on the first or second day of the feast, to perform those things that ought to have been performed, making ready the Chagigahs, and appearing in the court? If he was there the second day, he might be well enough said to be there about the midst of the feast, for that day was not a festival; unless perchance at that time it might have been the sabbath: and for absence the first day, there were certain compensations might be made.

"The compensations that might be made for the first day were these: if any one was obliged to offer on the first day, and did not do it, he compensated by offering upon any other day."

But that which is here said, that "he went up into the Temple and taught, about the midst of the feast," need not suppose he was absent from the beginning of it: nor ought we rashly to think that he would neglect any thing that had been prescribed and appointed in the law. But if may be reasonably enough questioned, whether he nicely observed all those rites and usages of the feast that had been invented by the scribes. That is, whether he had a little tent or tabernacle of his own, or made use of some friend's, which was allowed and lawful to be done. Whether he made fourteen meals in that little booth, as is prescribed. Whether he carried bundles of palms and willows about the altar, as also a citron; whether he made his tent for all those seven days his fixed habitation, and his own house only occasional; and many other things, largely and nicely prescribed in the canons and rules about this feast.