Yes, the first time these things come up it can be a bit uncomfortable. I remember the first time J went to school function with my kids and I. There were people there that he went to school with. He graduated from the same school system my children attend (small town schools, one high school, one middle school etc.). He was only 18 when we started dating. The funny thing is, it was me that was the worried one and wasn't sure if I wanted him to go.
And it honestly wasn't because of what I thought people would think about "us" or even about "me", I honestly was worried about what his high school friends would say to him..if HE would be embarassed, etc. Of course, he went anyway, and it was fine. Now he goes to all that stuff, and his sister (who is a school teacher in the same schools) and his mom go too. And it's all fine. I don't think I have ever had anyone say anything or even elude to anything to my face in public. I guess when we first got together we were probably the subject of gossip where we live, but that passes. The "new" wears off, and people find something else to talk about, and the "lady down the street dating the young guy" becomes old news.
Bottom line, if I really had one bit of advice, after 6-1/2 years together, to give people on this website, I would really like them to know that while the first year or so together is somewhat of an adjustment period, and you do go through things that are perfectly normal in this situation, like sometimes feeling a bit insecure for being older, or worrying a bit what people will think about you dating a much younger/older person, etc., this all passes. It honestly does, I swear. And then...as time goes by, the age gap really is not an issue any more in most cases.
I see a lot of long-time members posting on the site, and I remember when they (and myself) were going through these sort of issues, and now when we talk, the only issues I think ever come up have almost nothing at all to do with the age gap.
So yes, I think you should go to these functions together. I think he should attend, with you, as a couple. And if people give you a look or someone whispers something to someone else (which I doubt, but it COULD happen), who really cares? It's just one moment in a whole lifetime of moments, and just one person's opinion out of billions of people on this earth. In other words, it just doesn't matter.
((hugs))