Dear Bob,
I am writing this E-mail to invite you to come to the 18th birthday party of my friend, Wang Ping. The party will be held on Tuesday(1/9/2016) in Wang's home, 39 Lijaing Street, Qinhuai District, Jiangsu Province, PR China.
During the party, we will arrange fantastic activities, including singing songs, dancing, enjoying the birthday cake···
Looking forward for your reply!
With regards,
Li Ming