Question: Showground Central railway station was a temporary station used during an annual event held during what month?

Context paragraphs:
East Leake railway station: East Leake railway station is a former railway station serving East Leake, Nottinghamshire and is the only surviving Great Central Railway station accessed from an underbridge rather than an overbridge.  The station opened on 15 March 1899 and closed on 5 May 1969.  The Great Central Railway (Nottingham) passes through but the station has not reopened mainly due to lack of car parking, and with the station entrance being directly onto the road under the bridge, safety concerns were also a factor.  A small goods siding next to the station was redeveloped in the 1990s.  The station buildings have been demolished, with the rubble used to fill in the area from the road entrance to the platform.  The island platform remains in situ and could still be used if required.  Rushcliffe Halt is nearby.

Cariboo Prospector: The Cariboo Prospector or "Cariboo Dayliner" or The BC Rail Budd cars was a passenger train service in British Columbia, Canada, which used Budd Rail Diesel Car trains.  It was operated by the Pacific Great Eastern, later known as the British Columbia Railway Company and then BC Rail.  The train ran from BC Rail's North Vancouver railway station, the one located a few blocks from the current North Vancouver railway station used by the "Rocky Mountaineer", and ran to Lillooet railway station.  From there a section was split from the train that would continue down to Prince George BC Rail station located in BC Rail's Prince George yards.  This train service ended along with the other BC Rail passenger services in 2002.  A section serving the line between Lillooet, Seton Portage, and D'Arcy was replaced by the Koaham Shuttle.

Bihar Sharif Junction railway station: Bihar Sharif Junction railway station, station code BEHS, is a railway station and under Danapur railway division of East Central Railway.  Bihar sharif is connected to metropolitan areas of India, by the Delhi-Kolkata Main Line via Mugalsarai-Patna route.  Station is located in Bihar sharif city in Nalanda district in the Indian state of Bihar.  Due to its location on the Bakhtiyarpur-tilaiya main line many Patna and other cities via express trains coming from Rajgir and Gaya Junction stops here.  Bihar Sharif has well connected trains running frequently to New Delhi railway station, Patna Junction, Varanasi Junction railway station, and Howrah Junction railway station.  Bihar Sharif is well connected with Gaya Junction, Rajgir railway station, Tilaiya railway station, Bhagalpur railway station, and Kiul Junction through daily passenger and express train services.

Dharmabad railway station: Dharmabad railway station is a railway station belonging to Hyderabad railway division of South Central Railway.  The station is situated in Nanded district of Maharashtra, India.  Its station code is DAB.  The station is on a single track non-electrified broad gauge line.  There is a demand to transfer this railway station from South Central Railway zone to Central Railway zone.

Shaoguan Railway Station: The Shaoguan Railway Station () is a railway station located in Shaoguan, Guangdong, China.  The original Jingguang Railway station used this name before, but it has renamed as Shaoguan East Railway Station.

Hazur Sahib Nanded railway station: Hazur Sahib Nanded is an "A-Category" railway station serving the city of Nanded in the state of Maharashtra, India.  The station falls under Nanded Railway Division which was formed in 2003, until then the station used to be a part of Hyderabad Division.  It is one of the major railway stations of South Central Railway (SCR), It has many facilities such as lifts and escalators and specially cleanliness is very good.  The station lies on Secunderabad-Manmad line and has high traffic because of Takht Sachkhand Shri Hazur Abchalnagar Sahib, which is the resting place of one of the Sikh gurus.  No other station except CSTM on one side and Secunderabad on the other are as best as NANDED.Cleanest Railway station in Marathwada region.

Showground Central railway station: Showground Central railway station was a temporary station in the inner southern Adelaide suburb of Wayville, located 4.4 kilometres from Adelaide station.  The station was only used during the Royal Adelaide Show in early September each year.

New Delhi railway station: The New Delhi Railway Station (station code NDLS), situated between Ajmeri Gate and Paharganj is the main railway station in Delhi.  It is the fourth busiest Railway Station in the country in terms of frequency of trains after Kanpur Central, Vijayawada Junction and Delhi Junction and most busiest Railway station in India in terms of passenger movement.  Around 185 trains starts, ends, or passes through the station daily and handles 500,000 passengers daily with 16 platforms.  The New Delhi railway station holds the record for the largest route interlocking system in the world along with the Kanpur Central Railway Station i.e. 48.  The station is about two kilometres north of Connaught Place, in central Delhi.

Adelaide Showground railway station: Adelaide Showground railway station is located on the Belair and Seaford/Tonsley lines, and is located in the inner western Adelaide suburb of Keswick.  It is four kilometres from Adelaide station, and replaced Keswick station and the temporary Showground Central station.

Royal Adelaide Show: The Royal Adelaide Show (colloquially known simply as "The Show") is an annual agricultural show run by the Royal Agricultural and Horticultural Society of South Australia.  The Show always begins on the first Friday in September, and runs for 10 days (9 until 2013).  It is held at the Adelaide Showground, located in Wayville, a suburb of Adelaide, South Australia and is attended by up to half a million people every year, making it the State's biggest event.

Supporting paragraphs: Showground Central railway station Royal Adelaide Show
Answer: September