An NPC must be in Love with you before you can begin the process of marriage.
On the 7th or 14th day of the season go to loverwood, over to the left of the High Priest you will find a White Rose.
Gift the White Rose to your loved one. After your initial marriage proposal the Road to Marriage task will begin. Wait for the following day for next steps.
The task will update, asking you to take your partner to visit a place. Go find them and ask them to follow you. They will then pick a date spot for you to visit. Take then there.
You will then be given a selection of tasks to accomplish to prove your love. You tasks will update each day, one task per day, starting the following day. Complete the ritual by accomplishing them all...
- Gather Charmweed.
- Collect an Egg.
- Get Flour.
- You will then have the recipe for the Pie of You and I. Bake it using the ingredients you've collected.
- Give the pie to the High Priest. He will give you a Binding Band.
- Gift the Binding Band to your loved one.
Upon receiving the Binding Band, your partner will accept your proposal, bringing up the wedding planner.
Choose the wedding date. Make sure not to pick a date that clashes with anything else you have planned.
To start the ceremony turn up on the day, anytime before the start time. Head to the gazebo in Loverwood and interact with the High Priest to start the ceremony.
During the ceremony, a spirit will enter you both and raise a stat at random, for as long as you both remain married.
After the ceremony, your spouse will be at your family home on the farm.