"We have a venue, food and music so far," she told PEOPLE Saturday at the 2nd Annual Fur Ball at the Skirball Fundraiser benefiting Kitten Rescue. "We're getting married next summer in Los Angeles. We're keeping it small."
The actress, who got engaged to Kirk on June 30 while they were vacationing in Europe, has checked a few items off her to-do list and says she's enjoyed every minute of it.
"We just got our save the date cards in, and they're adorable – after many hours and many proofs later," Fischer says. "We're going to hold them until after the holidays before sending them out so they don't get lost in the holiday mail. They were fun to pick out and [it] was a very fun girlie experience to touch the paper."
She said the wedding won't have a theme, but there's one thing she will focus on: the menu.
"I'm a foodie, so I want to have really good food. We found a great caterer and had a two hour tasting and I left so full," she says. "We tried like four different entrees and 12 different appetizers."
Next on her list? "Our next big thing is flowers, and I'm sure by the end I'll know every type of rose that grows and where it originates from," Fischer says laughing. "Right now, I'm like, 'Eh, I don't know.' I'm definitely going to have some roses in there – they're my favorite."
A Happy EndingFischer, a longtime volunteer with L.A.-based not-for-profit Kitten Rescue, spoke at the event about Dunder and Mifflin, two kittens she and some crew found on The Office set and hoped to find homes for.
"The happy ending to the story," she told the audience to thunderous applause, "[is] that Dunder and Mifflin have been adopted, they were adopted together, they found their forever homes."
This is the second year in a row Fischer has hosted the event. She told PEOPLE she'll keep helping any way she can. "Organizations of every kind really take a hit when the financial climate is the way it is. It seems there’s always more to be done."