Birdie, how is this done?

[Willow Rivers]

Does it have to be at a certain time in day? certain season? certain weather? I have tried it several times and no luck so far.

[Lucis]

Ok, I had to throw poor Alice off two times to get it... Ouch.
It's summer in my current save file and I initiated a play during midday (Choosing 14:00 - 16:00 but starting as soon as she gets to the plaza at around 12:00)
I had to first make her jump a bit high (even if she didn't request it), but not too high and then throw her up to almost at the end of the bar and she came crushing down with a bird. It seems to be random, though.
You can do the seesaw multiple times during a play/date so just keep trying, but I guess don't go to the end of the bar immediately?

[Akio]

You need to have them launch in the air, falling back down with the dialogue saying something of "I caught a bird". It takes multiple times in order to get this.

[LillyKay]

All they keep saying to me is, "that was scary" (-14) lol.

[ClayburnGriffin]

How does the seesaw game work?

[worstcase11]

@: ClayburnGriffin
The seesaw only works during dates or playdates as you need a partner to play it.
You need three date-action points left to activate it.
If you get near the seesaw on a date during daytime either you can initiate the game or your partner will ask you to play it with you.
After a few ups and downs your partner will request you let them go 'higher' or 'lower'.
An action bar will appear with a target zone displayed.
You need to hold the space bar until it reaches the target zone (careful there is a lag).
if you manage to hit the targetzone successfully you will gain points, if you miss it your partner will be disappointed.
You get a few tries (4 or 5) wihich will add up when the game is over.