I've found that the FL attractions usually open 15 to 20 minutes after fireworks end, assuming no issues with the safety checks and the park is still open (most cases, I think fireworks are well before the park closes these days). The lines (at least for Peter Pan) will start forming before then and when the attractions re-open, CMs will escort the line to the attraction. Toontown does not (usually?) reopen after fireworks.