Seeking Japanese clothing and food for multicultural day Kogarah

Kogarah High is holding a Multicultural Day on 29 August 2014. I was wondering if you know of any Japanese caterers/commercial food outlets that do a good deal for schools on Japanese food. We need a supply of Japanese food to sell to our students from a stall on Multicultural Day.
Where would it be possible to purchase Japanese flag bunting and other paraphenalia for dressing our stall?
Also, do you know of any costume hire shops that rent out traditional Japanese samurai and/or geisha outfits?

Regards,
Jonathan Morris.
Kogarah High School.  Jonathon.Morris@det.nsw.edu.au