Useful explanations before entering the arena
Had Ken as a guide. He gave a helpful overview of sumo (some history, interesting facts, rules, etc) as well as what to expect inside the venue (interior layout, where to buy chankonabe, etc). We then went into the venue at around 2:40pm. The makuuchi (senior division) entrance wasn't until 3:40pm, so there was more than enough time to explore the arena--no need to be in a hurry!
Great background info to hype you up before the tournament!
Great to have insight before watching a tournament. Our guide Rames was very informative and it was great to walk around the area to see the sumo stables.