Not as far as I know.. but I'll be more than happy for somone to prove me wrong
Holmbush ran a series of pump only monthly walkons during 2009/2010 season. They were really popular for a while with 25-30 players turning up at times, although the average was more like 15-20. Despite plugging the event like crazy here and on other forums, eventually support dwindled and Holmbush were forced to scrap pump only days. Ross and Neil were a bit gutted as they really enjoyed running these events.
We also had a one off pump day at Campaign in Surrey.. but nothing more came out of that one
Other than that I did play several 3 man X-ball tournaments last year at Ambush in Southmpton. Kitch kindly offered to piggy back a 3 man pump series on the back of regular Super5 games. Sadly support yet again dwindled after a few months. Teams repeatedly let us down.. saying they were going to enter pump squads only to be a 'no show' on the day. In the end we had to call it quits as there just wasn't enough players to make it worthwhile.
I love pump format games but haven't played the format for over a year now.. there's just nothing on offer