Know what happens between arrival and dinner
The less familiar parts of a wedding are often the intervals: arriving before the ceremony, finding the reception after the ceremony, and waiting for dinner. Read the schedule and check whether venues change. Ask about seating if the invitation does not explain it.
Arrange your own transportation and know when you expect to leave. If you will stay overnight, confirm accommodation independently of anyone you may meet at the event. A clear plan leaves fewer logistics to solve while you are trying to be social.
Give the first conversation an easy beginning
A simple introduction can be enough: your name and how you know the couple. Asking how another guest knows them gives the conversation a shared starting point. You do not need a memorable story or an explanation for why you came alone.
If you know one person besides the couple, ask whether you can meet at arrival or during the reception. The couple will have many demands on their attention, so make your plan without depending on them to introduce you throughout the evening.
Choose the parts you want to enjoy
You can join a table conversation, watch the speeches, dance when you want to, or take a quiet break. Attending solo does not require being sociable every minute. The purpose is to celebrate people you care about, not to perform confidence for other guests.
If questions about your relationship status feel intrusive, prepare a short answer and move the conversation back to the occasion. You can be warm without providing personal details you would rather keep private.
If you would rather bring company
Check the invitation before asking someone to accompany you. A named invitation for one person is different from an invitation that includes a guest. If the wording is unclear, ask the hosts and accept their answer without assuming a spare seat is available.
When a guest is permitted, a friend may be the simplest option. Professional accompaniment is another choice if you want prepared, platonic company. Plus One, Properly provides this service in the New York metropolitan area; the founder attends personally, and every engagement is considered individually.