General admission tickets for $5 will go on sale Tuesday, April 18, 12 pm noon and will be available on this webpage.  New York Times bestseller Abraham Verghese will read from his new novel The Covenant of Water, followed by an on-stage conversation with Houston author and physician Ricardo Nuila. The evening will conclude with a book sale and signing.  ABRAHAM VERGHESE – a physician, professor, and writer for more than four decades – was awarded the National Humanities Medal…