The couple, who announced their engagement this week, are thought to be exploring options of how they can make the celebrations inclusive given the outpouring of support from the British public.
They could allow people to enter a ballot for a so-called ‘Golden Ticket’ where people can put their names forward to attend.
‘The couple of course want the day to be a special, celebratory moment for their friends and family,’ the Telegraph reports Prince Harry’s communications secretary Jason Knauf said.
‘They also want the day to be shaped so as to allow members of the public to feel part of the celebrations too and are currently working through ideas for how this might be achieved.’
They will get married at Windsor Castle’s St George’s Chapel in May.
It is thought they might open a ballot for people to come inside the walls of the castle, which is what the Earl and Countess of Wessex did in 1999.
They invited 8,000 members of the public to get closer to the action in a move which was very popular at the time – it was even dubbed the ‘People’s Wedding’.
The couple also took part in a carriage ride through the town to meet and greet well wishers, another move which is thought to be under consideration again.
Mr Knauf said: ‘Prince Harry and Ms. Markle are leading the planning process for all aspects of the wedding.
‘We look forward to sharing these details with you in the months ahead as decisions are made.’
Metro.co.uk has contacted Kensington Palace for comment.