With what may we bind the aravos branches for Hoshano Rabboh? Kitzur Shulchan Oruch 138 (2) says one should use leaves of the lulav. Is that all? How about a rubber band?
If I recall correctly the reason we eat a Seuda on Hoshanah Rabah is it is the last day we have a Chiuv to eat in the Succah. Suppose it is raining and you can not eat in the Succah do you still have ...