Pompey fans are being urged not to head to the High Court in London tomorrow in case a crucial hearing does not go ahead.
The court has not announced when the hearing will be starting, and the two groups hope to stop fans wasting money on train fare up to London should the case not go ahead until Thursday.
The hearing is between club administrators BDO and former owners Portpin.
It is to decide whether Fratton Park can be sold to the PST without the approval of Portpin, which holds a financial charge over the stadium and should have final say in what happens to it.
It will also decide the value of the stadium, and is therefore a crucial ruling for the PST, which is hoping to buy Pompey and make it the biggest community-owned club in the UK.
Now the Pompey Supporters Trust and SOS Pompey groups is inviting fans to a special event at the Chimes Bar at Fratton Park on the final day of the court case - whenever that might be.
Ashley Brown, PST chairman, said: ‘SOS Pompey and PST, in conjunction with the club, have arranged for the Chimes Bar to be open on the final day of the court case and I would urge all fans to attend that event instead.
‘It is frustrating, but we simply don’t know when this case will start. We really don’t want fans to waste their money going to London, when it could well turn out proceedings don’t even start.’
The court case, which will determine the club’s future, could start any time from the morning of Wednesday April 10 but no time has yet been fixed.
‘Representatives from the PST community bid, including our legal team, will be in court from Wednesday morning and we will be keeping fans back at Fratton Park informed of what’s going on.
‘We have been overwhelmed by the show of solidarity by fans and we feel this event at the Chimes Bar is the perfect focus. There will be community bid representatives at the event, who will be available to answer any questions fans may have,’ he added.
Bob Beech from SOS Pompey said: ‘SOS Pompey have supported the PST bid since day one and we understand why fans would want to feel a part of an historic day for our club and they will be able to do this by joining us at Fratton Park.’