Whoever is inviting, which after twenty-five years of marriage is often not the couple. This is the single biggest difference between an anniversary invitation and every other invitation in a family’s life, and it changes the grammar of the whole card rather than one line of it.
The couple host. Standard at a twenty-fifth and a thirtieth. Their names go at the top, first person or third as you like, replies come to them, and they can be as informal as they want about a party they are paying for. Examples one, six and seven below.
The children host, and the couple are guests. Standard from a fortieth onwards, and the version that catches people out, because the two people the card is about are not the two people inviting. They are being honoured rather than married, so they do not appear until after the host line, and they arrive introduced: “Claire, Duncan and Fiona Hargreaves request the pleasure of your company at a dinner in honour of their parents, Rosemary and Alan Hargreaves”. Nothing follows that about a service, a celebrant or a time to be seated, because there is nothing to be seated for — which is the whole distance between this card and the identically-hosted vow renewal invitation, where that generation-swapped grammar gets a paragraph of its own. Three of the eight wordings below are written this way: examples two, three and four.
The grandchildren host. Common at a sixtieth, when the children are themselves in their sixties, and at any milestone where a grandchild is the one who organises things. Warmer register, shortest card of the lot, and the honoured couple are named as “our grandparents” rather than by relationship to the hosts’ parents. Examples five and eight.
Whoever hosts, name one person on the reply line with one real phone number or email address. “R.S.V.P. to the family” reliably produces silence: a guest who cannot see who to answer answers nobody, and the calls that do come all land on whichever sibling is easiest to find. Outside the card, none of this changes the envelope — how to address wedding invitations handles a fifty-year guest list of widows, second marriages and doctors the same way it handles a wedding one.
Set out with the words taken away, an anniversary card is these lines in this order:
[Who is inviting — the couple, or their children by name]
invite you to celebrate
[number] years of marriage
[Couple's names, in the third person if the children are hosting]
[Day, date and year]
[Arrival time]
[Venue]
[Street, town]
[What happens — dinner, tea, drinks, speeches at a stated time]
[Your no-gift line, if you want one — one line, no explanation]
[Reply by date] · [one named person and how to reach them]