Sumo event questions

Hi all, visiting Japan for the second time this fall. We were thinking about going to the special sumo event in Tokyo on October 5th. I have been talking with buysumotickets as they sell meal sets for the event, and it says food sales will be limited in the description of the event. Their FAQ also says you can not bring in any outside food or drink but seems that online people say it’s fine to bring in your own. Does anyone have experience going to a special event? Any other advice is welcome as well! We are thinking of getting box B seats. Thank you!

by ScoobyDoobyJew21