Dear Sumon Kazi,
Greetings from TopChinaTravel! Thanks for contacting with us.
We are glad to know that you are planning to participate the travel fair hold in Guangzhou. But we can only provide the invitation letter if you book the tour or relative travel service with us like transfer, accommodation, etc.
Thanks for your kind understanding.
So if needed, you can provide some basic information to us (group size, duration, travel request, etc), we will be pleased to make the arrangement for you accordingly.
Any further inquiry or question, please feel free to contact with us.
Kind regards,
Zoe