Hello Paul,
Thanks for using our plugins and welcome to the forums!
We are limited in supporting customization according to our support policy, but I can try to give you some pointers.
I see you are using Event Tickets Plus. If you would like to set all ticket prices to $30 that is really challenging, because first you will need to create tickets for the imported events. If the event doesn’t yet exists, then it doesn’t have tickets so you will not be able to set a price.
There is also an Event Cost field for the events which is hidden if you have Event Tickets active, as that takes over.
Let me know how I can help further.
Cheers,
Andras