Fix grammaticality of the sentence: At last but not least, a couple of complaint about the organisations itself: first, in the information sheet you provided there were any directions or any map within how to reach the conference centre (quite complicated near you don't know this part of the city); second, the lunch was a huge mess, has to gone to separate stands for each food (one for fishes, another within vegetables, etc) and having to makes queue every times.
And last but not least, a couple of complaints about the organisation itself: first, in the information sheet you provided there were no directions or map of how to reach the conference centre (quite complicated if you don't know this part of the city); second, the lunch was a huge mess, having to go to separate stands for each dish (one for fish, another for vegetables, etc) and having to form queues every time.