Can you buy tickets at the convention center for the dinosaur event this weekend?and where to park this weekend where no tow and low pay?

There's a lot that has tiered rates per time (I think it was $6 for one hour, $10 for 2-3 hours, etc) right acrossthe street by the church. Stay out of the spots that are church-goers only though. Justparked there a week ago.

I believe there was a Box office last year. parking ramps around the convention center

If you're looking for an inexpensive way to get there I would suggest taking a bus and parking outside the so-called city limits. Otherwise there is a ramp right across the street and those are normally 10 to $20 single pay no time limit. As for being able to purchase tickets I'm sure you can but I have not seen the event to be able to tell you that you can do that for sure in fact look online you may be able to purchase them there and have them before you ever get to the building.