The sixth aliyah commands us to observe the festival of Sukkos. Mentioned here is the taking of the beautiful esrog fruit, the lulav (the palm branch), the willow branches and the myrtle branches, and dwelling in booths. In verse 36 it mentions that the eighth day is a "day of detention". On that expression Rashi says it is like a king who invited his children to a feast for a certain number of days, and when their time came to depart, he said to them: "Stay one more day, it is difficult for me to part with you". This is how G-d feels about us, he wants us to stay with him another day after all the Yom Tovim in Tishrei.