I am in Allen.. maybe we are neighbors, I have no clue.
We are all outside a lot. My daughter is now a Jr in Sr hHigh school (we are Plano schools) but I sub at the local elementary and i know all the children and parents.
There are 2 bunco groups in my neighborhood that meet monthly. You probably would not want involved in the one I was in because there is usuallt a lot of wine flowing, everyone walks so no one is driving and it is a good social time but I wouldn't want to put you in a spot where you would feel uncomfortable.
How old is your child? Do you frequent the playground? Around here, if you set out on a quick walk after dinner, rest assured, youll be gone a long time because you stop and chat to everyone who's out.
We have a neighborhood website that has social activities and times listed. Maybe check that out.
Also, I like the Cinco de Mayo idea since it is that time of year. Whatever you do, I'd keep it light and casual.