Probably!
It should be fine as it is. As long as your initial marriage is legal, there shouldn't be any need to register it in Northern Ireland. It will be recognised.
You must follow the laws of the country you getting married in. Research it. google (for example) Getting married in Brazil.
No it is not tacky to register for a wedding at Target. Many couples getting married will have a wedding registry at many stores.
It wouldn't be TOO difficult to marry her but it IS probably necessary to register
Jill Ireland married to David McCallum in 1957 Jill Ireland married to Charles Bronson in 1968
New Zealand
Yes, Jill Ireland married to David McCallum in 1957 Yes, Jill Ireland married to Charles Bronson in 1968
Kathy Ireland married to Greg Olsen in 1988
Jill Ireland married to David McCallum in 1957 Jill Ireland married to Charles Bronson in 1968
There is no particular tradition for getting married in April. People in Ireland get married in all 12 months of the year. People prefer to get married in good weather, so there are naturally more weddings planned for the summer months, but there isn't a particular preference for April or any other month.
She got married in Scotland
Getting married in any foreign country outside the UK is not recognised in the UK until you register the marriage after moving/residing in the UK. Exactly the same applies for any marriages taken place outside your residing country.