Your reasoning doesn't make sense though because the only members so far this year who've had more than one event on the same day for their birthday are Ayumi, Haachin, and Akane. Maria and Sakura only had one event each on the days during which their birthday events took place. I know it's frustrating that she's only getting one event on the day her birthday event takes place, but you have to realise that Maa-chan isn't the only one in Morning Musume this year that this has happened to, so she's not exactly being singled out and treated unfairly while the rest of the group gets lots of events for their birthdays because that's not what's happening at all.
Please don't follow up a statement such as your reasoning doesn't make sense with misinformation. Not only did Maria have two events, Harunan had 2 events, Yuuka had 2 events, Morito had 3 events (added specifically because a lot of people failed to get in!), Nanamin had 2 events, Akari had 2 events, Karin had 2 events, Yamaki had 2 events, Funakki and Rikako will have 2 events, and those are just the ones I have and will be going to. Nearly all H!P members get 2 events so everyone who loses the first lottery gets to go to the second one (they have a system that can check the losers). Mizuki and Kudou both had one event at Ariake as well (the biggest one they do events at) and there was no backlash because people could attend, but Up-Front made a misjudgment in giving Maachan only one performance when there is a much higher demand to see her. They should have realized they could have filled Ariake twice, or a venue such as TFT 1000 at least twice, especially because a lot of people always attend both events and they would have both all the people who were left out as well as people who already went to see the first one. It was poorly set up.
But Momochi doesn't have a lumbar disc herniation so using her as a reason why something as simple as sitting or standing in the same position for a long time isn't going to cause any problems for someone who does have the condition doesn't make sense at all. Before I ended up with the condition I could do all of that without any problems at all. Now that I have the condition (which I've had for a lot longer than Maa-chan has had it) simple things such as sitting or standing in the same position or a small walk can end up leaving me feeling stiff and uncomfortable and on some occasions in a lot of pain and unable to walk properly. In fact I recently had a bad relapse and couldn't walk upright properly for several days due to something as simple as sitting most of the time. One of my thoughts when it happened was "Please don't let this happen to Maa-chan" because it left me feeling extremely uncomfortable and frustrated because I hadn't been doing anything that would count as physically intensive beforehand to cause it happen and I know that if that happened to Maa-chan it would leave her feeling extremely frustrated and upset and in turn leave her fans feeling upset and worried for her.
Where did I use Momochi as an example for saying "something as simple as sitting or standing in the same position for a long time isn't going to cause any problems for someone who does have the condition?" I can not find that part anywhere. I clearly using her as an example to show how non-intensive and lax Birthday Events can be set-up; if Maachan wants to do anything else that is fine. But that is not the problem in the first place because for the umpteenth time, she is dancing in concerts for hours a day, she shouldn't have to do anything close to feeling any type of discomfort in comparison to that. I feel for you condition, but your situation at that point is not like Maachan's situation at this point or her doctor, family, fans and especially Up-Front now would have not allowed her to do an intensive concert tour with hours of dancing and rehearsals. They already messed up before. Was it easier for you to do hours of dancing and singing than it was to sit/lie down/walk around/do anything you could possibly do at a BD event? Even if the answer is yes, which is unlikely, the argument could even then still be made that she could have simply danced and sung for the majority of the event like she does at concerts, if somehow she doesn't have a problem with that. There is no counter-argument. We should not underestimate Maachan when she is feeling fine enough to do intensive concerts. A BD event is absolutely nothing compared to that, she could be doing it in the same way as she spends time at her house.
I'm actually pretty sure that people with back conditions do get medical dispense for jobs that requires standing still, or just sitting in a chair at an office. 
Which simply means it is of course straining for the back of someone.
Is it a mismanagement from Up-Front ? Certainly (too bad, before Tsunku did get all the blame, now it's those dumb Up-Front staff doing all they can to mismanage everyone in the roster).
But is it related to a kind of safety regarding Maachan medical condition ? Most probably.
I am pretty sure people in that kind of condition are not doing concert tours. Kuro, are you really comparing people putting the blame on a song writer who even said he had little control over what the company manages with the people putting blame on the company management? There is quite a bit of difference. Sure, the company who disregarded Maachan's worsening condition can do nothing wrong, yup.
The real problem is not mismanagement, or at least not exactly in the way that you're claiming it to be. Having only one event in a day and Maa-chan having to take it easy so as not to have a relapse is not mismanagement.
Wait, where was it announced that they are not doing another event because she has to take it easy? If there is none, than this is an assumption. An unlikely one too with how intensive her activities are. All I can see is a company booking too few seats for customer demand. That is not an assumption.
However running a system in which people who are already paying members for a fan club can only get event tickets to see their favourite members if they win them in a lottery and not properly estimating the amount of fans who'll be wanting to attend the events so that they can decide where to have the events or how many events in one day that'll need to have to accommodate everyone who's wanting to see them if the venue they've booked isn't big enough to have all the fans at the one event is poor mismanagement and needs to be addressed as soon as possible.
So it is poor management and we agree, good. They somehow greatly underestimated customer demand despite knowing how in demand she is with her comeback and current popularity and messed up, which caused a lot of fans to be upset. That is all there is to it, anything else is just speculating. Let's move on from this, more Maachan pics plz.
