Well...
Here are Celia's Heart Events
Black: Rainy day, around 10am to 4pm( not sure, I did it on around 11am-2pm), not Monday
*Tell Vesta the truth
Purple: Walk to Goddess Pond around 3-6pm, again, not Monday
*Tell her she can come and that you don't think so
Blue: Dr.Hardy's clinic 8am to 12pm, rainy day
*Tell Dr. Hardy that you're not together
Yellow: Blue Bar 4-6pm, not Wednesday
*Talk about Farm life
I'm not sure about Muffy's heart events since I didn't marry her. I only got up to Blue.
Muffy's heart events (up to Blue)
Black:Blue Bar, 3-5pm
*say cheerful and pretty
Purple: Beach, not Wednesday, rainy day(can't remember exact time)
*Tell her to meet the person
Blue:
Blue Bar, 6-8pm, not Wednesday
*say milk
Oh I tried Nami too, but only up to Purple
Nami's heart events (up to Purple)
Black: Inner Inn, 12pm to 2pm, must be a rainy Tuesday
*tell her you'll stay
Purple:Inner Inn,8-11am (not sure...)
*tell her how to brush and milk
...
That's about it...
Anyway,I married Celia and Lumina.
Sorry I couldn't help much with Muffy's and Nami's heart events.
3DS Friend Code
Ran: 5069-4867-0474