EXPO will open at 100. It's quite easy. Someone has to enter a sell order at 100 and someone else has to enter a buy order at 100, and those orders will be matched and open will be marked as 100 (See how SLTL opens at 60 or 61 almost everyday while it's trading range is 55-58)
When EXPO opens at 100 the kind of people who bought WAPO at 10,000 and ALUF at 192 will barge in and buy like crazy while WAPO themselves start selling their stakes. This will probably drive the price down to about 80.
At 60, another bunch of investors, the kind of people who bought TAFL at 240 will wade in thinking 'damn, this looks attractive it's trading 10 bucks lower than the open'. Then JKH will start selling driving the prices down to about 60 (1000% profit).
When price reaches 60, the kind of people who paid 350 for JKH shares last year will enter the share ('damn 40% down from the open right?'). By now those who bought above 90 will be really worried. Other people who subscribed to the IPO will now start selling, driving the price down to about 30
At this stage normally sane investors who refuse to touch CARE at 250 or CSF at 15 will think, damn this is down 70% guess it's safe now. But their buying will not be enough to hold the prices steady. People who bought in the first half hour are now on the verge of jumping out of building. Meanwhile the market closes at 20
Over the next few days the share price gradually declines to 14. All those who bought above 75 will now sell absolutely disgusted, wowing never to buy on emotion again. The price will now drop below the IPO price. Suddenly JKH, WAPO etc will start buying back the shares they sold at 100 or even 50. The price will then start moving up and the retailers who bought at 90 and sold at 15 will scramble to get back on board. The cycle will continue once again.