用英语写一篇邀请朋友参加父母的结婚纪念

Invitatin for Wedding Anniversary

Dear (name),

My parents are going to hold an anniversary for their xxx-year Wedding anniversary on (date). We would like to invite you to the anniversary. it will be at (place), probably at (time).

(自己再简单描述一下活动).

Hope to see you then.

Best wishes.
(name)