I'd be very reluctant to put a possible chance of romance in the hands of a friend unless they were especially renowned for their subtlety and delicacy when matchmaking.
In your circumstances, I'd work out what night I was free, get his number and ring him saying 'Hi, don't know if you remember me, we last met at (state event) and when I was talking to x recently she mentioned your name when I told her I'm being given a couple of tickets for (theatre/show/gig/art preview) and but I've got no-one to go with'.
I'd continue with 'Is the sort of thing that would interest you, and would you be up for accompanying me - I'd really like to go but I'm not comfortable about going to the venue on my own'.
Hopefully, this will lead to more general chat and he'll ask the date, check his diary, and say yay or nay.
If he says nay, say no problem and you hope he doesn't feel that you've taken a liberty by asking. At the very least, you'll have broken the ice and will have something to chat about when you see him next.
Of course, if he says yay you may have to scrat around to get the necessary tickets (make sure you've chosen an inexpensive event!) but, if you can't get them, no worries because you can meet him at the appointed time and explain that the friend who was gifting you with the tickets, who only lives a couple of miles away, was driving over to drop them off before you had to leave the house to meet him, but their car's broken down halfway.
You would have called him, but after you'd commiserated with your friend and looked up the AA/RAC's number for them you realised it was too late - he'd be on his way, and you're so sorry if he's disappointed but perhaps you can buy him a drink by way of compensation (note: make sure the meeting point is by, or outside of, a pleasant pub).
Jeez, all of this has taken me an age to write and it's probably taken you almost as long for you to read - but in practice it shouldn't take you more than a few minutes on the phone to find out if he's interested in you or not.
Alternatively, wait until you bump into him again, use the usual English conversation starter of a comment on the weather, and go through the above spiel with whatever variation you care to make.