Hi from Maddie. Sadly, I don't know of any local groups for transmen on Friday and Saturday.
For anyone else interested, Portland's Q Center (4115 N Mississippi Ave in North Portland) had the following groups recently:
SOFFA is the first Sunday in December at 4-6pm (newcomers 3.45) and it's for significant others of people who have transitioned or are transitioning. I attend this and would be happy to provide more info.
The MtF support group seems to be every Friday night at 7pm.
TranzGuyz seems to be one Sunday a month, 6-8pm. "The group has been meeting monthly since November 2006, and has been growing over the years. An average meeting size might be 15-25 people."
There are also meetings called Trans-Fem* ("Trans-Fem* is a social-support group for transwomen, intersex, genderqueer & questioning people who were assigned male at birth. We meet for fun, discussion & support around what it means to be on the trans-feminine spectrum. There are no requirements for transition status or presentation to attend this group.") and Gender Queery ("This is a discussion group for trans, genderqueer, folks outside-the-gender-binary, and allies. Meetings have great discussions on an ever-changing topic followed by informal social time and always take place on the 1st Monday of the month."). See their web site for more. BUT - nothing for guys specifically that I could see on Friday or Saturday.
Wishing you many good adventures on your quest. / Maddie