Hey Mr Forte,
Here's my advice to you. Nothing is wrong with ur plans, u mustn't travel to nigeria for ur trad and if none of ur parents can witness ur court wedding, don't fret about it. You are not there alone.
About applying for a visa, your best bet is to leave your fiancee out of it and go for strictly tourist visa. Having F1 US visa gives u temporary residence in US and it's an added advantage. It's not a guarantee anyway but I know a couple of students in US that got canadian visa at just one snap. Get enough school proof and give it a shot.
All the best!!!!!