In addition to having no fans for baseball games at Wrigley Field in 2020, the Cubs had six concerts scheduled last summer that were all cancelled.
Now, those concerts have been rescheduled, per this page on the Cubs website.
Per this Chicago Tribune article, the Cubs will be honoring previously purchased tickets for those six shows, and they are selling tickets online at the link above. Just poking around the ticket links there, it appears tickets are being sold all around the ballpark without restriction, even though the Tribune article states:
It’s unclear how many concertgoers will be allowed at Wrigley Field this summer or if they will be required to take any special precautions to prevent the spread of the virus.
The six concerts at Wrigley this summer, per the Tribune article, are:
>> The Chris Stapleton show on July 17, 2021, originally scheduled for Aug. 29, 2020
>> The Guns N’ Roses show on July 21, 2021, originally scheduled for July 26, 2020
>> The Hella Mega Tour with Green Day, Fall Out Boy and Weezer on Aug. 15, 2021, originally scheduled for Aug. 13, 2020
>> The Lady Gaga show on Aug. 27, 2021, originally scheduled for Aug. 14, 2020
>> The Def Leppard and Mötley Crüe show on Aug. 29, 2021, originally scheduled for Aug. 28, 2020
>> The Maroon 5 show on Aug. 30, 2021, originally scheduled for June 13, 2020
By city ordinance the Cubs are permitted four concerts per year without having to give up any night game dates. The current night-game schedule for 2021 has space built in for additional shows.
It’s certainly possible that by July full attendance will be allowed at Wrigley Field. But it’s too early to know that for sure, and what this means for Cubs ticket sales later in the season is unclear. If you’re interested in any of these concerts, tickets are on sale now at the cubs.com link above.