It doesn't get any more Beta than being asked by a chick to go to a single's event as "friends", and then she leaves you.I’ve never heard of a singles event where it was required to have a platonic pal with you.
But I’ve attended that way a few times. I’ve had female friends invite me because they didn’t want to go alone. I went just to get out of the house.
A few times it was a singles dance. No dudes approached her because they thought she was my date.
Another time it was a singles event at an art gallery. She (different chick) separated from me during the event and left with some guy lol.