How to write the invitation for the third anniversary of the elderly?

The invitation information can be written as follows:

Dear Name of Invitee: Hello! Three years ago today, the name of the old man passed away, and his/her voice and smile are still deeply engraved in our hearts. On this special day, we sincerely invite you to attend the memorial service for the third anniversary of the old man's name.

The event will be held in [specific place] on [specific date], and we hope you can take time out of your busy schedule to commemorate him/her with us. If you can attend, please reply to this message and tell us your attendance so that we can make corresponding arrangements.

Looking forward to your arrival! Name of the inviter.