Wedding tips with EP3

Tomorrow I am attending my wife's best friends wedding, kilts are at the ready! Now I'm looking for some last minute photography shooting tips as I will be taking my EP3 20mm 1.7 and 45mm 1.8. The wedding is taking place at a country house, mostly indoors. No idea what the lighting will be like, but I suspect it could be difficult.

I'm not sure how extensive my shooting will be as I am looking after my 2 year old son as well.

So any tips? Specifically with the above mentioned lens as they are both fairly new to me

Cheers

Blue