Wedding invite wording: brunch reception & birthday

I don't think the wording really has to change from any other wedding. You will just have the time of the wedding. People don't need to know the exact type of food being served unless they need to choose a meal ahead of time. Also, I would assume that these guests would know its you're birthday. If you were hosting 150 people, I can see not everyone knowing, but I would guess the 15 are super close to you guys to have made the cut. If anything you can make a little joke and thank everyone for coming to your birthday party on the day of or something like that. I would probably skip any indication of it on the invite.

I don't think I'd mention it's your birthday unless you are wanting gifts for both events. Those really close to you already know it's your birthday and I'm sure they'll send / give you something in addition to a wedding gift.

As for the reception, I think I'd mention their will be a small brunch reception immediately following the service or leave out "brunch"

We're having a sunrise wedding followed by a brunch reception and we're just keeping it simple by notating the reception is following immediately (hopefully it will be common sense that there will be food at such an early hour, although nowadays can't assume anything).

I wouldn't mention it's your birthday either on the invitations but if your spouse wanted to on the day of i think it would be ok. for my wedding it was right on my MOH's birthday and i wrote it all in the programs and menu and had everyone sing her happy birthday

I wouldn’t mention your birthday on the invites, your closest friends and family will probably notice it’s your birthday! I don’t think you need a specific template for brunch either, I’m sure they’ll know what to expect if there’s a late morning start time.

The invitation wording will not change. Just the date and time. People will assume a brunch wedding based on the time.

I would not mention your birthday. If these people are close to you, they will already know it is your birthday.

I don't think you should call out that it's your birthday, but if you want to set expectations for what type of meal service will be provided, you can always put "Brunch style Reception to Follow" instead of "Reception to Follow" (wording on a standard invitation). I agree with PP that the time will probably tell them enough, but if you're worried about being super clear on it, that's how I would handle it.