Variable Resident Parking Restrictions - Signage Rules

I recently parked in a residential parking bay on a Saturday and received a PCN. Upon parking there I did note that Saturdays was an additional enforcement on "Event Days" however no signage anywhere nearby or on the entrance to said CPZ was identified to advise of when an Event Day actually was in effect.

My local authority has thrown out my Informal representation on the bases that their photography shows the standard street signage making reference to Event Day restrictions but my understanding is that it is the local authorities job to advise when such Event Day is.

I don't follow the local events and thus would not be privy to that knowledge just like any visitor to our local authority that is out of such loop.

My question here is am I right to appeal this to an adjudicator on the grounds that the parking restriction was not clear as to if it was currently enforced while I was parked there or is the council not required to give such notice of when the variable restirction is in effect and thus the owner of the vehicle has to make subsequent investigations to determine when a event day is actually ongoing.

Sorry if I repeat myself or am unclear and feel free to ask additional questions.

Marcus