Adam Clarke on Zechariah 14:16

Shall even go up from year to year - The Jews had three grand original festivals, which characterized different epochs in their history, viz.: -

1. The feast of the passover, in commemoration of their departure from Egypt.

2. The feast of pentecost, in commemoration of the giving of the law upon Mount Sinai.

3. The feast of tabernacles, in commemoration of their wandering forty years in the wilderness.

This last feast is very properly brought in here to point out the final restoration of the Jews, and their establishment in the light and liberty of the Gospel of Christ, after their long wandering in vice and error.