One who did not offer the chagigah on the first Yom Tov of the festival, may offer the chagigah throughout the festival or on the last Yom Tov of the festival.  If the festival passed and he did not offer the chagigah, it is no longer his responsibility. Concerning this it is said: A twisted thing cannot be made straight, and what is not there cannot be numbered.

R' Shimon ben Menasya says: What is [referred to as] a twisted thing cannot be made straight? One who has an illicit relation-ship and begets a mamzer. Were you to say that [the reference is to] one who steals or robs [this could not be the meaning since] he can make restitution and [thus] make it straight.  R' Shimon ben Yochai says: We do not call one twisted unless he was initially straight and then became twisted. And who is this? This is a scholar who forsakes the Torah.