Kinsale.ie has very concise information about how to get to Kinsale by car and bus.

See their information here

We encourage you to car share or take the bus where appropriate. Kinsale is a vibrant town and worth spending the whole day. Parking is limited at the Trident hotel. We encourage you to park at the free carpark up near Supervalu and the firs station. That way you can take your time to walk through the town to check out the businesses offering discounts to you as ticket holders on the day.

Please be advised that it is a 15-20 minute walk from the carpark to the venue, please consider this when wanting to be in time for the talk/workshop you want to attend.