The Police Service of Northern Ireland said anyone found to have blocked the Garvaghy Road will be treated as participating in an "illegal protest".
The 25-year-old man was arrested in the London borough of Westminster on Thursday.
Sometimes in Northern Ireland, the definition of success is "nobody got hurt," writes BBC News NI's community correspondent.
A quarter of all marriages in Scotland involve couples who don't live here but see it as the ultimate wedding destination.
The Police Service of Northern Ireland said anyone found to have blocked the Garvaghy Road will be treated as participating in an "illegal protest".
The 25-year-old man was arrested in the London borough of Westminster on Thursday.
Sometimes in Northern Ireland, the definition of success is "nobody got hurt," writes BBC News NI's community correspondent.
A quarter of all marriages in Scotland involve couples who don't live here but see it as the ultimate wedding destination.