Absolutely, it's a really good event and we often get some great ideas. The tool section is always a must see and you can buy new and interesting tools there and watch demonstration. I think it might have been last year that I managed to get 2 bottles of very nice shochu on the last day from a stand that didn't want to take them home.
Quite often there are seed companies there so you can speak to their representatives about best growing conditions or buy new varieties they will be introducing. Mrs Nouka always gets new ideas from the packaging section and they will often give you a goodly amount of samples so you can try them out.
We've had some awesome free gifts from there that even years after we use quite often, last year one of our friends was given a whole load of mushroom growing kits the company didn't want to take home so her apartment living room was ram packed with mushrooms and she grew so many she was giving them away to everyone she new.
The last few years have had stands from prefectures wanting to encourage new farmers willing to move to their prefecture and they explain about the various grants on offer and what assistance the prefecture is willing to offer.
My one criticism of Makuhari Messe is that there are only a few restaurants inside the complex so if you want to eat there you have to either eat really early or queue for a very long time. A lot of people now seem to park in Funabashi Aeon
(oopps, Makuhari Aeon Mall not Funabashi) and grab lunch there before heading over to the expo to avoid the parking fees at the Messe car park.
You can get further details and apply for tickets here Nougyou World 2018