The two times you get your Dream Fest are decided by the production (guild) you've chosen - possibly automatically.
You can change it by an auto search in the production screen. It says there which times were chosen by the production for the Fest.
ok i have participate in my second Dream Fest. i have won again... Wuhu
I have already get a Combo (8) for the 4*Ticket Reward.
I will use that ticket simply for the Normal Gacha Trick in FGK^^
DMM FKG ID: 986648592
Name: Wutan
... Just a noob question, can participate to a Dream Fest during the 30 min or you absolutely need to be present at the first second of the Entry Time? I ask that because after a lot of changes of Entry Times I was able to get a Dream fest at 00:00, then when that was the finally time (after few hours of waiting), I came few seconds after the beginning and the Participate button stayed grey...
You can participate at any time during the half hour of the event, even during the last 10 seconds (though I highly advice against making it so close because of the popups and long loading times).
I've joined Dream Fest several times during its last couple of minutes, and usually lost horribly on those occasions because the opponent had already worn out my team. But also won a couple of times because of that, because the opponent figured he/she already won because I was offline, and left. Only for me to completely ruin his/her team during the last few minutes.
Well, so I guess there is a bug since my button stayed grey, and now the global Timer says I have to wait 23h and 20min for the next DF, which is not possible since there are 2 schedules each day...
Most likely your production has chosen a different Dream Fest time if your Participate button stayed grey. Only time you can enter if your Participate button turned pink. You can check the time selected by your production by going to Production page, located on menu button, and reading pink banner located below the "Top" tab. You can also look at time remaining for next Dream Fest by looking at pink banner located in Dream Fest.
Last event we got a Lion King reference in the enemy names. This time around we've got an ABBA reference instead. XD