a special discount

[Ashiuhto]

Please check out the following paragraph.

This museum is open from 9:00 A.M. to 5:00 P.M., and there will be no ticketing one hour before closure. Pets, food and drinks are not allowed to take along for fear of making messy and dirty and hindering the rights of other visitors. We also offer foreign visitors with voice message explanation service, if you are willing to get it, make your inquires at the reception desk for more information about procedures. We will start from this July to hold the Prehistorical Taiwanese Aboriginal Culture Exhibition, last for three months. A group over 20 people will get a special discount of 20 % off.

[emsr2d2]

Please check out the following paragraph.

This museum is open from 9:00 A.M. to 5:00 P.M., and there will be no ticketing one hour before closure. The last tickets will be sold at 4.00 pm.

Pets, food and drinks are not allowed to take along for fear of making messy and dirty and hindering the rights of other visitors.
No pets, food or drink are allowed.

We also offer foreign visitors with voice message explanation service, if you are willing to get it, make your inquires at the reception desk for more information about procedures.
Foreign language audio descriptions are available. Please enquire at reception for more information.

We will start from this July to hold the Prehistorical Taiwanese Aboriginal Culture Exhibition, last for three months.
The Prehistoric Taiwanese Aboriginal Culture Exhibition will open this July and will last for three months.

A group over 20 people will get a special discount of 20%. off
You have said "discount" so you don't have to say "off".

See above. You don't have to explain why no pets, food or drink are allowed.