Gelder said she had been inspired by a Björk song called Isobel: "[I] have a strong recollection of when I was 18 at university and studying performance art, hearing that line in a Björk song called Isobel: 'My name's Isobel, married to myself,' and thinking, crazy as that sounds, I totally get that.
"It's about making this pact or promise to yourself and then somehow enacting that in how you live your life from that day on."
Gelder decided to propose to herself in a park bench situated in Parliament Hill in November and the ceremony took place at a Devonshire farmhouse in March. Around 50 people attended, including her sister.
Despite having some doubts in February - "I found myself asking, why was I really doing this? Was it just some vainglorious stunt?" - Gelder maintained that she was happy with her decision.
Her friend Tiu, who trained as a celebrant, oversaw the marriage, helping and encouraging her as she planned the unusual wedding.
However, Gelder stuck to tradition when it came to the ring and the vows - although the ceremony was sealed by kissing her mirror image rather than another person.
Gelder said: "I really don't see it as any kind of feminist statement, but creating a wedding of this kind on my own terms felt incredibly empowering.
"My self-married status - meaningless though it may remain in the eyes of the law - has also given me this great sense of clarity. I seem to sense much more clearly than before if something is worth pursuing or best left alone."
She added: "And just because I married myself, it doesn't mean that I'm not open to the idea of sharing a wedding with someone else one day."
- Independent