I saw them six days later in Boston and I was 24.
Damn. What were the crowd sizes like back then? I have no idea how big Dream Theater was in '93. I know Pull Me Under was a big hit at the time, but I have no real gauge for their popularity in the early 90s.
I saw DT on November 12 and 23, 1992, February 12, 1993, and June 3, 1993. The first show was at a venue that, several years later, was repurposed to this:
https://thelibrarygc.com/7000-garden-grove-blvd-westminster-ca-92683/ (WARNING, possibly NSFW, depending on where you work). My own local band had played at the club a couple years earlier. I would say probably not more than a couple/few hundred people. The second show was at a similar venue that no longer exists. The third show was at a club in Hollywood, known then as The Palace, and now called The Avalon. The Avalon's capacity is about 1,500, and I can't really tell you how close to capacity the crowd was, but it was a pretty full house. When Fates Warning's Parallels lineup reunited for a few shows in 2010, they played at The Avalon. I think the capacity for the fourth show was probably between 2,000-2,500. Again, not sure how full it was.
Keep in mind that PMU was released in August 1992. It's initial success gave DT the ability to tour outside the NY/CT/RI/PA area for the first time. They played about 125 shows between June 1992 and April 1993 (including shows in Japan, the UK and continental Europe). The rise of PMU during the early stages of these shows allowed them to play increasingly larger venues. That said, they were never more than a mid-level metal band. PMU charted, but it didn't go gold as a single and, as popular as I&W was, it still took two and a half years for a gold certification. Also, I expect the may have played some larger venues in the northeast. My area (southern California) was still clinging somewhat to glam metal and embracing grunge.