The event – which celebrates off-beat hobbies, pastimes and collections – had to be postponed earlier this month due to national mourning for Queen Elizabeth II.
Access and learning manager Jo Dowding said: ‘The Geekend is about bringing together people who are passionate about their interest or collections. It’s about embracing what is diverse and eclectic and thinking “wow, I didn’t know that”.’
For the first time, there will be a costume competition running during the weekend and entrants in full costume will be admitted free of charge.
In the galleries, there will be a chance to meet artists Chris Simcox and Penny Dawes, archaeologist Phil De Jersey and experts on fossils (including dinosaurs) and flint.
There will be a mini-figure hunt for the young and Guernsey Plastic Modellers Group members will be displaying and demonstrating their hobby.
The Frossard Theatre will be used to show classic cartoons and a draw-a-long Pokemon, created by a member of the museum team.
On Sunday, Guernsey Gaming For Good will be inviting visitors to join in with classic games like Super Mario Kart and discover some new creative games too.
Most of the attractions will be inside the museum but some will be outside.
This includes a display of living history from the Guernsey Military History Company.
Events on the terrace will feature acoustic musician Dave Wheeler, Morris dancing, Guernsey Dancing, and the Samba Burros.
Some attractions are taking place on both days but other events are timetabled.
The first of the weekend is a Geeky Tree Tour of Candie Gardens, hosted by Andy McCutcheon, at 10.30am on Saturday. This tour is free of charge and reveals the secret life of quirky trees inside the gardens.
Visitors are advised to look at the timetable if they are attending for something specific. A full timetable is available on the website www.museums.gov.gg/geekend22 or Guernsey Museums’ Facebook page.
The Big Geekend takes place at Guernsey Museum from 10am to 4pm. Normal admission applies, but it is free to those in full costume who are entering the costume competition and to Discovery Pass holders.