The Enchanted forest

Hi All,

Looking for some advice please. I am going to this http://www.enchantedforest.org.uk/tonight and was hoping I could get some advice on settings for my Oly EP3. I do have a tripod BUT also a 2 and 7 year old and looking the weather forescast its likely to be raining

I have a 20 1.7, 45 1.8 and 14-150m - which would be best? Which mode P, A, S and what about ISO's? As it will be dark scenes should I compensate with exposure? I have LR4 too which can hopefully rescue some reasonable images,

What do you think?

Cheers

Andrew