If the invited guest is absent on the first day for a valid excuse, is he obligated to attend on the second day?

The questioner : Shaykh, may Allah reward you. If the invited guest is absent on the first day for a valid excuse, such as travel, and he arrives before the second day, is he obligated to attend on the second day?

The Shaykh : He is not obligated, because the original walimah (wedding feast) on the second day is not as certain as it is on the first day.

The questioner : But what about this person who was absent?

The Shaykh : Yes.

The questioner : Is it not certain?

The Shaykh : No, it is not certain, because he was invited for the first day.