I don't know if this is like, a really obvious thing or has been pointed out before and it could just be me overthinking a coincidence but the pattern I noticed was that at least one of the characters that get a bloomfes in the event is somehow related to the focus character/unit of it. 

To explain better: 

OVER RAD SQUAD → Kohane/VBS focus; Meiko is one of the characters that get a Bloomfes card, and she is also of VBS's starting VS 

Dream Stage → Nene mixed focus
Rui is one of the characters to get a Bloomfes card; Both Rui and Nene are in WxS and they're also the only ones in the group to be childhood friends 

Unfading wishing → Akito mixed focus; An is one of the characters to get a Bloomfes card, they are both VBS members and the ones who originally were there to see RAD WEEKEND from their group 

Find the dream view → Shiho/Leo/Need focus; Honami is one of the characters to get a Bloomfes cards, she's also the only Leo/Need member to have a card in the set so I think this proves at least this one has to be intentional. Luka also gets a Bloomfes card and is the starting VS for Leo/Need! This is the only time where you can connect both to the main event, I believe 

Deeper and Deeper → Rui/WxS focus; Kaito is one of the characters to get a Bloomfes card, he's the starting VS for WxS

Again, I don't if this is common knowledge it's just an observation I felt like sharing, and it could of course be a coincidence after all but it's happened in all Bloomfes so far so that feels kind of unlikely 

Pattern I noticed on Bloomfes cards