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I don’t think the sign at the location is the problem
The problem is that they are saying there was an event on the day parked  there
But there must be a sign to warn motorists that an event is on but there was no sign of an event in G1 they said the sign was in E1
I appealed and it was rejected
So my next step is to do representation

This is the google street view of where I parked
I parked exactly where that bike is parked under the road sign. And the picture of the road sign was also sent with the PCN
But please how do I write a representation

https://maps.apple.com/?address=London,%20SW17%200NN,%20England&auid=12106244587369337672&ll=51.432868,-0.182023&lsp=6489&q=SW17%200NN&_mvs=CjYJwxJ5M263SUARsARO5pNNx78ZAACSlKDZTEAh6Z6Cbk3wakApktwsMyfPC8AxAAAAAAAAAAASJgoQODM5IEdhcnJhdHQgTGFuZRIKV2FuZHN3b3J0aBoGTG9uZG9u

OP, I won a similar (but different) case here: https://www.ftla.uk/civil-penalty-charge-notices-(councils-tfl-and-so-on)/pcn-on-an-event-day-but-no-sign-it-was-an-event-day/

I won it because the Council website reported the wrong dates as event days. The council replied that the dates on the website were just an example and not to be relied on, but the adjudicator disagreed and cancelled my PCN.

I also represented that the sign they had put up was outside Earlsfield train station, where cars cannot park; it was a dozen lines of text, it was impossible to read it without stopping, and, if every driver did that, it would be total chaos. The adjudicator remained completely silent on this point.

As of now, their website still has the same dates (Oct 2023). You might try that defense (case reference 2240033072 https://londontribunals.org.uk/ords/pwslive/f?p=14952:70::INITIALISE::70:P70_CAS_REFNO,P70_PCN_REFNO,P70_RETURN_PAGE,P70_AST_CODE:1606505,2992486,60,APPEAL&cs=3-BwrpHTBMXr3-4KGuHeNFK2uoRhj3W5chyVL07dMSVN5jHRb15KGP924ubbMcPTDJs3Nf7UdjEILtEhcK65Dkw ) but I suspect the council will say that, since the date on their website is so many months in the past, then it is clear it was just an example.

Their website says there should still be signs on G1 https://www.wandsworth.gov.uk/parking/parking-zones/afc-wimbledon-stadium-event-day-restrictions/
If you can prove there weren't, I believe you should have a stronger case.

FWIW I think it should be compulsory for councils to mention the exact days on their website, and not just in some hard-to-read signs far away from the actual parking locations. It would cost them nothing. But then cash-strapped councils wouldn't  catch out as many motorists, would they?

Don't just rely on that case, the merits of which would be in the minority among adjudicators IMO.

Look at the website; look at the G1 entry sign locations - at least one is wrong, massively so; look at Moreton House; look at the style of sign outside, it's NOT even the same format as per the website(in fact it's two signs one of which has been photographed facing the wrong way; get your own photos.

GSV, May 2023; Moreton House (opp junction of Garratt Lane with Wimbledon Road); CPZ sign immediately outside with 'event day' board beneath facing towards traffic leaving G1.

https://maps.app.goo.gl/QbQNCHbj4FstPRRC6?g_st=ic

The ad hoc sign on the post as you enter G1 is there, but the glaring issues to me are:

The CPZ sign is not of the form given in the website or in the council's evidence to the tribunal in the cited case (something which the appellant in that case didn't spot!);
The lower sign is not firmly attached and can reverse as shown in GSV.

And the so-called parking place is covered by a waiting restriction for 'goods vehicles' of any weight for part of its operational time which cannot be.

OP, it's not clear to me where exactly you parked. You posted an apple maps link to a street (Garratt lane) which doesn't seem to have any parking?

As a starting point:

understand where exactly you parked
check on the council website what area it corresponds to
check if there was a sign where the council said there should have been https://www.wandsworth.gov.uk/parking/parking-zones/afc-wimbledon-stadium-event-day-restrictions/

For example, the council website states that the signs for G1 are located at:

G1 St. Martin’s Way/Maskell Road
G1 Garratt Lane/Summerstown
G1 Wimbledon Road/Blackshaw Road

If there was no sign, you can challenge the PCN on that basis. But you need proof. You can say that, according to the council website, you were expecting a sign at location X, no such sign was there, so the only logical conclusion was it was NOT an event day.

Be sure to take a screenshot or a video of the council website with some kind of timestamp, in case those esteemed gentlemen change it later!