The awesome thing about playing an instrument in front of people is that you can pretty easily block out the audience. Focus on the music, your playing, the violin. Take a few deep breaths and forget the people.
For the final chord, I would say maybe come up with a backup plan. Maybe you can just play the top two notes of the chord or even just the A? If you find that you are not as at ease as you had hoped while performing maybe knowing that you have a fall back plan for that last chord will help ease your mind. Don't plan on using the backup option, because I know you can do the chord, but just know that the option is there if it helps.
I have some of the worst stage fright ever, but in many ways I used to find playing an instrument in front of people to be fun (I use the past tense because I don't really have the opportunity to do it at this point). Conquer it and be brave and see how awesome it feels to do something that you are good at in front of people.![]()