Presale tickets for the 3/30 Raw at the SAP Center in San Jose, CA (it's the Raw after WrestleMania 31) go on sale at 10am eastern today. The presale ends on Friday at 10am eastern. The presale code is WM31RAW. You can also use presale code SanJoseVIP.
After the presale is over then tickets will go on sale for the general public on Friday. There are only about 12,000 tickets available so tickets should go fast since there will be a lot of wrestling fans still in town after WrestleMania.