Any recommended lots for parties?

If you have get together try a night club. Or for more family oriented ones a resturaunt or going to the park. With the update and sims being able to sit on the ground I think a nice pinic birthday sounds pretty nice.

Just bring things like the cake in your sims inventory and a stereo for some dancing. Maybe buy a drink try to have in the park pemanently having it on a table or maybe a vending machine somewhere. The San Mynshuno park lot is a pretty nice place after I renovated it a little bit.

Or maybe a pool party at a pool lot venue? ?

just remember you need a dining height table to center the cake on and either means to make the cake or make it beforehand

other than that everywhere is birthday venue

remember some rich kiddo had pool party on her bday when i was kid that was kinda cool

I just tend to age my sims at home tbh probably cause thats how i do my aging up irl

I love having my events at lots! For kids birthday parties, I have done:
-a pool party with ice cream and usually like a playground area, dancing, waterslide, sprinklers, all that fun outside summer stuff
-a bowling alley with an arcade
-a roller rink (i made an indoor one with an arcade and pizza and stuff)
-an outdoor park/playground with BBQ food