Following the horrific terrorist attack in Manchester outside an Ariana Grande concert, the idea of going to big arena shows has become a scary thought for some. TMZ reports that Live Nation is offering refunds for upcoming UK concerts featuring Katy Perry, Iron Maiden, KISS, Robbie Williams, Phil Collins, Depeche Mode, and James Arthur for ticketholders who now don't feel comfortable going to a show. They also report that Live Nation has made no decision on shows outside the UK.

Blondie were to have performed on Tuesday (one day after the attack) in London but postponed the show. "We are working to reschedule the event, and we will communicate details as soon as possible. Thank you for your understanding." Take That postponed their show in Liverpool on Tuesday night, as well as the three Manchester Arena shows that were to have happened this weekend.

Live Nation is also stepping up security at all their events and festivals -- you may want to arrive earlier than planned.

A memorial happened earlier today in Manchester's St. Anne Square. The Guardian reports that after a minute of silence the crowd broke out into a sing-a-long of Oasis' "Don't Look Back in Anger," and video of that is below.