OK, here's the deal for this event.
Sorry I won't meet you in San Ysidro--but crossing over just makes things too complicated and unpredictable.
I'd love to have somebody volunteer to gather people at the San Ysidro McDonalds across from the final trolley stop and lead them off like Moses to meet me, but this seems like a group capable of finding their way.
If a group forms at McDonalds, I'd suggest 12:45 as a good time to start across the border. You walk south, follow the swarm. Up the hill, through the turnstiles, down to the northbound line. Cut through the line and turn left in the plywood "alley" along the street. When you come to the end of the handrail, at the stairway to the overpass, go up and head west across the footbridge. Keep going until you descend on the other side of the highway. Go straight west, by the crowd of taxi jerks and the big union building. Keep left you can't miss the Caliente race book. Inside, it's all tables and chairs. Outside, a few steps further are the tables of the open air "Michoacan" taco stand. I will be there, wearing a red flowered Hawaiian shirt.
If you have a Mexican phone I am at[masked] in case you get misplaced. Or call my USA number, which should work that close to the line. [masked]-5423. I will be there until at least 1:15, giving a half hour leeway on the posted time. Mexico residents can meet me there, or along the route.
We can discuss transportation on the spot. I think it best to grab a blue bus into town (if we're lucky we can get one all the way down to Playas) and transfer to the yellow/white vans that will take us right to the park.
It's hard to estimate how much interest/time the show will hold, but as I said, we'll be at the beach. I'd suggest moving down through the park towards the Southwest corner. We've done the art fair we can can walk along the murals of the boardwalk, hit the beach, or grab some eats/drinks. There is a nice sporstbar with seafood a hundred yards south of the park, and a coffeehouse with great desserts and a popular pizza place next door another 100 yeads past that.
Moving to the north we'd pass a couple of cool coffeehouse, an pizza/sushi place with incredible ocean views, several Mexican style bars, and eventually the border fence/lighthouse/whale skeleton.
Return to the border or downtown TJ is very easy anytime anybody wants to... we'll discuss that en route.