Well, besides the quantity of THC that is, I'd be concerned about how to pay for that amount of edibles. Also, depending on which state or country you're in, that may be well above the amount of edibles that you can purchase and possess at a time, so it may be risky from a legal perspective. I'm not going to give you some bullshit about doing brain damage or anything hyperbolic like that, just be careful and have a sitter handy if you simply must do it.
I'm very hard headed when it comes to edibles, but going over 100mg (one bag of standard edibles) is also going to take a hard time to wear off. When I take 100mg in a sitting, I'm usually stoned for more than a day, so plan on being stoned for a very long time. The half life of oral THC can be over 50 hours, so dont plan on being fully functional for a while.
Plan ahead so you have all the food, beverages, and entertainment you'll need because you're not going to to want to go in public for a few days, and, of most importance, DO NOT DRIVE until you've been sober for at least a day. Also, despite this being "only THC", there would be a realistic chance of you becoming delusional or just straight freaking the fuck out.
Please, if you do choose to do something this stupid, at least do it in the least stupid way possible. Legal cannabis was hard earned here, and a story like someone freaking out from eating 200 separate edibles is something that the media would be all over, demonizing the cannabis, not the irresponsible user.
Please reconsider, if you don't reconsider, at least do it in the safest way possible. Maybe try eating smaller amounts and work your way up to doses like that. 100mg can be a hell of a ride for someone with 26 years of recreational marijuana experience.
I've said my piece and dont mean to come across as condescending or just a dick, I just dont want to see you end up in a hospital, jail, or psychiatric ward. THC is a real psychedelic drug, most people just haven't gotten to the point that they get full on visuals with eyes open or closed, so be prepared for that as well.
Be safe....