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It is a good idea to provide age guidance for your show. And guidance on who the target audience is.
Please specify the time your event will end. Be sure to account for both programming time and intermissions if any.
Make sure to specify if discounts can be combined or not. Also, if you require company badge or proof of membership or age or senior citizen status, be sure to specify it clearly.
Provide email or phone number or chat session for ticket buyers to call you, while they are checking out. Don't lose a sale because you couldn't answer their question.
Make sure to provide your ticket re-issuing instructions.
Again, make sure to provide your ticket re-issuing instructions.
It is a good idea to state your refund and exchange policy in clear and simple terms so people can grasp it quickly. KISS (Keep it Simple, Stupid) is the mantra here.
Depending on the nature and timing of your event, this question may or may not be relevant. If it is, do say if there will be food. Or mention if there are options close by.
Venue map is not sufficient. Please provide parking information..
It is a good idea to mention what time check-in starts and if it is a heavily subscribed event and you expect long lines, let them know to arrive early and how early.
Sometimes similarly named venues exist in cities. Check the automatic map that your event platform or Google generate to make sure you are infact pointing to the right venue.
Make it clear if entry requires attendees to produce physical or mobile ticket to avoid this time consuming check-in nightmare.