I was listening to an Islamic video and the Sheikh mentioned this for people unable to fulfill the Hajj:

"Whoever prays al-ghadaa (i.e. al fajr) in congregation, then sits remembering Allah until sunrise, then prays two units of prayer, has a complete reward of Hajj and `Umrah [The Prophet, sallallahu `alayhi wa sallam, repeated 'complete' three times for emphasizing]." [at-Tirmidhi, classed as Saheeh by al-Albani]