Friday, friday.

I woke up 9 am and the weather was suffocating. I went to the mall and I bought 2 tickets to the Lolapalooza (quite expensive) and then I had lunch in my house. After that I went to the veterinary hospital (public and free) and I had two dogs castrated castrate two dogs. Now, I'm eating somenthing having something to eat and then I'm before going to the gym. That's all, that is what I do on my fay off.

In your first sentence is there anything to connect these two statements?

> I woke up at 9am because the weather was suffocating.

> I woke up at 9am and the weather was suffocating.

If not then these should be two separate sentences.

In the second sentence there is no need for the second "I" as you have already said "I" at the beginning of the sentence.

In the third sentence either you can say:

"the Lollapalooza festival"

OR, just

"Lollapalooza"

We only need a "the" if there is a second noun (festival) to connect it to.

In the fourth sentence it is bad practice to start at sentence with a solitary "Then"  Connecting it as one sentence is better.  This also lets us get rid of the "I" as you have already mentioned it at the beginning of the sentence.

IN the fifth sentence "vet's" is a more common way of saying "veterinary hospital".  Nobody would ever say "veterinary" - it's too hard to say even for us!

I also doubt it was you who castrated the dogs, so you should say "I had two dogs castrated"  If you are indeed a vet then maybe it was you!

In the sixth sentence you say "I'm eating something" - why don't you want to tell us what it is (it sounds like you're eating what was castrated!) A more common was to say you're eating something without saying exactly what it is would be to say, "I'm having something to eat"

You also have another repetition of "I'm"  If you say it at the beginning of a sentence there is no need to say it again.  You can just say "before going to the gym"

Do you normally do this on your day off, or just this particular day?

If it's what you normally do, then "That's what I usually do on my day off"

If it's just what you did on this particular day then "That's what I did on my day off"

Saying "That's all" implies you didn't do very much.  I would suggest you didn't use that at teh beginning of the sentence at all as it sounds like you did quite a lot!