Before I continue, I should point out I feel this way about pretty much everything extracurricular, from protests/rallies to school-based activities. Don't expect me to show up for school fundraising activities at 2:00 on a Thursday.
Judging much? Can almost feel the Ron Swanson being channeled here.
A lot of people don't work an 8-5, M-F shift, and a lot more can certainly get a day off during the week if they are successful as well. Then you look at the much more flexible nature of working in the tech industry, which is heavy in cities like Seattle and San Francisco, and you're really just starting to make assumptions.
You forgot to read past just the work hours part (and to be honest midnight or whatever still wouldn't get an 8-5 crowd there unless they have time to get dinner and get to bed afterward), regarding the taking time off stuff; I haven't been able to leave work without being always within reach by my phone for work or involved with family responsibilities.
Which leads me to the fact that weekend scheduling is not the only stipulation I stated. It also needs to be kid friendly. And while some of the more outrageous things seen at gay pride events are part of that point it also applies to plain religious or political activism events. Locally we've had cases of speakers cursing to get the crowd worked up, people who disagree arguing and fighting, and so forth. If you want me to think you should be proud then act accordingly.
I also think it's a bit much to suggest that young people shouldn't be taking pride in their sexuality just because they haven't paid bills yet.
If by pride you mean self-respect for being themselves, sure. But then every adolescent should be able to and few do. I just had an idea! Nerd Pride events! I can see it now, a giant baking soda volcano float, young people in lab coats holding flasks boiling over with dry ice gas, model rockets launching, cosplaying astronauts, parade balloons of the planets (with Pluto coming up 500 feet behind the parade), and a massive Tesla coil powering it all.
If you mean the high or inordinate opinion of one's own dignity, importance, merit, or superiority, that should be earned. Otherwise it is just bordering on narcissism, which isn't uncommon in many young people in these days of instant gratification.
In short, if you can puff out your chest before your brain is completely developed then get off my lawn.
Quick google search reveals SF's pride days are June 29-30, a Saturday and Sunday. Seattle's is on June 24th (Sunday). Louisville's is June 14-15 (Friday/Saturday). New York's is the last Sunday in June. LA, Sunday May 19th. Houston, last Saturday in June. Halifax, July 27th (Saturday). I'll give you the family friendly bit because it could probably be worked on but it seems that most of them are on the weekend. There's also what Cody posted, it's not a stretch that people living in the city can get a day off work.
And I know gay couples with kids who won't go to the one in Louisville, because they have kids they are responsible for. They are not kid-friendly events. The most they will do are the activities at their church after the Saturday night service because those will be reserved and family-oriented. I'd go with them to that, if it weren't scheduled on my birthday weekend.