spice is always a good neutral liner (most people can wear it)
and if you are going soon, and fall in love with some colors, check out the palettes too, a single eyeshados sells for $14, and you get a palette with 5 e/s for $36..
depending where you are going you can also check out the pigments... if you founf one in a nice neutral or pink, they are great, you can use them for eyeshadow, wet as a lipliner or eyeliner, or mix them with clear gloss for a lipgloss....