The good thing about your child meeting and playing with these future classmates, is that she will already know someone. Keep in mind with these new classmates, they will be inviting each other to play dates, parties, for years to come. It is good for you to also get to know the parents.
We were fortunate to have excellent neighborhood schools, this allowed us to develop close relationships with the students, parents and the school teachers(their families) and administration. We were close by, so these events were not as much trouble.
BUT it is good to set your priority. Sure our family time is precious, but each interaction with other families, other friends is an opportunity to build your community. Different people, make us even more complete.
We have some families that we met through our daughters schools that are just like family. We even know their grandparents, they know our daughters grandparents, cousins, Aunts, Uncles.. etc.
I feel very blessed to have this community. I know our daughter was very fortunate. They still keep up with her and cheer her on, I do the same with their families.
This is the beginning of an exciting time for all of you!