There are only about 250 tickets left for WrestleMania on 4/2 which means it is very likely to officially sell out within the next week. Tickets for the WWE's Hall of Fame sold out within the last week.
WWE Fastlane on March 5 in Milwaukee, WI drew about 11,000 fans - which was approximately 2,000 short of full capacity.
Source: Wrestling Observer Newsletter. Subscription information & prices available at f4wonline.com