On Monday morning, June 6th, your event image will go from 600×400px to a 1440×600px billboard. Worry not! Your current image will do just fine, but make a note to log in come next week, and upload a bigger one to avoid pixelation.
What does a good image look like?
Less is more here, always think visuals over words. The new event page has all your important event information – date, price, and address - highlighted for an easy overview just beneath the image. So no real need to add it to the image too.
To ensure legibility always leave a minimum margin around the logo based on the x-height. The x-height is based on the flat, horizontal bottom part of the “b” and the ditto top of the “i”. Do your best by eye and it should be just fine.