What is a vow renewal? Vow renewals are ceremonies where a couple renews the vows they made to each other when they were first married. Many couples like to hold vow renewal ceremonies on a particular anniversary, like a 10th, 20th, or 50th wedding anniversary, but there is no requirement that take place on a particular date. It is entirely up to the couple.
You can hold a vow renewal ceremony for many different reasons. Because of the Covid 19 pandemic many couples today are having to postpone their planned for big wedding. A vow renewal ceremony at a later date when the pandemic is over would be a perfect way to celebrate ones marriage.
Remember that a vow renewal ceremony is not a legal ceremony. It is symbolic. You are already legally married. Because of that, there are nor requirements that you have a legally appointed wedding officiant present. However, if you are not already legally married (with a valid, recorded marriage license) then a vow renewal ceremony does not make you legally married.
Look here for some sample vow renewal ceremonies, numbers 11 and 12.