Art by Henrique OliveiraThe drama Orphans, by Lyle Kessler, has its final performance this weekend. The stage is set when two young men, getting by pulling petty crimes, kidnap a drunken businessman. Things don't go as planned, however, when the three, all of them orphans, form a pseudo-family. 8 p.m. Friday and Saturday. Country Playhouse, 12802 Queensbury. For information, call 713-467-4497 or visit www.countryplayhouse.org. $12.This is your last chance to see "Henrique Oliveira: Tapumes," the