Nikon d5100 with nikkor 50mm f1.8g?
How about shooting a wedding event with the above equipment?
It would probably work if you know what you're doing. First thing to consider is you'll have to walk everywhere, you can't just zoom to a tight shot you have to walk to it. And that's not a bad thing except during the ceremony. Most families don't want a photographer roaming all over the church during the
ceremony, they want you out of the way and not seen. A 50 is a good lens but very limiting in that kind
of venue.
If you have to ask, you shouldn't be allowed anywhere near a wedding.
It depends. If you are asking if that's a good lens to take along to a wedding, then it's not a bad choice. You can get a lot of nice shots with a 50mm and the f1.8 will help a lot indoors if you want to minimise flash usage. Take a standard 18-105mm or 16-85mm zoom as well for when the 50mm isn't wide or long enough.
If you are planning to be the "official" photographer then you obviously haven't got the equipment - or the experience - to do it. A 50mm won't be wide enough for the group shots. You will probably need something longer at the reception unless you plan on standing right in front of the speeches and block everybody's view.
Good wedding photography is not just a case of rocking up and taking a few pictures. Have you got a backup battery - or camera body - in case yours goes wrong? Have you even thought about lighting? Do you have a good flash with diffuser - that you know how to use without thinking about it?
What about planning the day? Have you been to the venue to check out the best places to take photos for both dry and wet days? Do you have a plan of what photos have to be taken? (I know some are spur of the moment, but there's a huge list of "must have" pictures).
If you were planning to be the official photographer then I'd strongly advise getting somebody else who is good with experience to do it. Pay them if necessary and tag along as helper. Make that your gift to the couple.
The best way of getting into wedding photography is as the helper for somebody experienced. The last thing you want to do is screw up the photos on somebody's big day because you didn't know what you were doing. Learning from somebody else saves you from making the worst mistakes.
If you really do insist on doing this yourself, then read some books on wedding photography, try to get to a wedding as an observer before the one you are going to photograph, and if necessary hire the extra lenses - you can arrange that online at places like this: http://www.lensesforhire.co.uk/ - and make sure you've got a friend with a spare camera just in case!
It will work if only the couple, the priest (or officiating person), a witness or two and you are present.
The 50mm is short telephoto and will be difficult to use in getting wide angle shots which is more what you need for a wedding. The 18-55mm kit lens would be perfect though.