To quote my DGM, if you're not practicing you're not in a state of grace so you shouldn't be taking communion anyway...
A lot of protestant churches don't do communion, certainly here in Scotland it would only be high anglican that would do communion. Never seen it done at a Church of Scotland wedding. Anyway, you won't look rude if you don't take it, just not confirmed or of that faith.
Been to plenty of weddings, both Catholic and Protestant and the only ones which had communion were the Catholic services. You will probably find it’s a non-issue. You could always ask the bride / groom if there will be communion.
As PPs have said I believe that most Protestant weddings have a Church service and blessing rather than a full mass. I've been to a LOT of weddings in churchs both Catholic and other Christian denominations and it's never crossed my mind so I suspect that none of the anglican/protestant weddings I've been to have included communion.
If it does include communion it is unlikely that anyone will be offended by you taking communion if you really want to but it may be safer to just not. You will be among many people who receive just a blessing or don't go up to communion at all and you will certainly NOT cause offence by not taking communion.
Firstly, as lots of people have said, there isn't likely to be communion at the wedding. Secondly though, and it will probably be announced as it is during any other communion service, you will be welcome to take communion if you so wish. I think the RCC frowns upon this, but really, it's up to you to decide. You could always go up for a blessing (leave your hands by your side)
I've not seen communion at a CofE/Baptist/Methodist/free church wedding - only at the (only) Catholic wedding I've ever been to. My own (CofE) church describes participation as this (in case it helps in future) "we welcome all baptised Christians in good fellowship with their own church" to take communion - as said previously a blessing is free for all, believer, or not.
Are you in Ireland or England - ime such things can be a bigger deal in Ireland. (But the fact you are even asking does make me wonder if you are in Ireland). If you don't go to church/mass very often anyway, is it that important to you to get communion at the wedding? Other question: unless ppl know your religion in advance, how would they know you are a catholic or a protestant - though again, we have better skillz in that department in Ireland (though I've now lived outside of Ireland for longer than I lived there). But in England they are so open minded that the criteria for our local catholic school, doesn't require all children to be catholic - as long as they belong to a trinitarian christian denomination, they are on the list.