Do I need multisite?

Hi,
I am have poured through the forum and googled for hours but with no joy.
I have my domain (hosted by JustHost) setup and running my website at mydomain.co.uk

I want to add another wordpress site at mydomain.co.uk/wedinfo for our wedding information. This site will have a different theme and menus. I don’t want to disturb my main site and it won’t have much traffic. I will delete it after next year and probably won’t ever have another wordpress site on the same domain again.

Can somebody please recommend the best option? Multisite seems like massive overkill.

Any help greatly appreciated!
Cheers,
Stewart