I AM the 411, so here are places to dance or be otherwise entertained every night, EVERY WEEK:

MONDAY: ~Vault Martini-downtempo and deep house 21+: NW 12th between Everett and Davis. Come see Evan Alexander flow while you lounge and sip martinis.
~Drunken Karaoke@ the Ambassador- 21+: 84th and Sandy. I have been hearing this is tons of fun.

TUESDAY: Insufficient info

WEDNESDAY: ~Crush @ Ohm- DnB 21+: NW 1st and Couch downtown, starts at about 10pm, usually goes until 2:30am and is FREE unless there is an awesome headliner from out of state, even then it is cheap. Lounge environment, great lighting, nice crowd but they do search backpacks.
~Housecall @ PALA- house music 21+: NW 3rd and Couch downtown, starts around 10pm, usually goes to 2:30am and like Ohm, is FREE unless there is talent from out of state. No smoking inside, good food, and friendly bartenders. Also they have a VIP room you can rent if you would like with a full bar in it.

THURSDAY: ~Groove Nation @ Fusion - electro house/ techno 21+: NW 2nd and Couch downtown, starts around 10pm and goes until 2:30am+, usually having later hours until 4:30am, which rocks! NO COVER! Nice lighting, friendly staff, 2 bars and plenty of lounge space.
~Comedy @ Ohm- 21+: NW 1st and Couch downtown, usually $5.
~Soul Nite @ Rotture-21+
~LAST THURSDAY ONLY monthly! ON NE Alberta Street, between about 10th and 30th-ALL AGES: This starts at around 3pm, and goes until after dark, and could end in finding nice people to hang out with for the rest of the night if you wanted or go home early with your family. On display and for sale are artistic items such as paintings, drawings, jewelery, pottery, clothing, food, and and many other unique items, mostly crafted by local artists. Also you may see parades, performances, and fire dancing at any moment! Very unique and amazing.

FRIDAY: ~Detour @ PALA- house/funk/techno/dnb/breaks/dubstep 21+: Variety at NW 3rd and Couch downtown! Starts around 10pm and goes until 2:30am, cover is anywhere from free before 11pm to $8, depending on the headliner.
~After hours @ Fusion-electro house n techno 21+: NW 2nd and Couch, excellent local djs who rock the decks and guest djs! Fridays the dance floor is packed with a variety of people. Cover is usually $5, and the place stays open until 4:30am+.
~Pulp Friction @ BCs-mostly dnb/ occasional house, breaks, and dubstep 21+: SE 25th and Powell, NO COVER! Very casual environment, excellent local talent, food, and the place has a pool table and some games. A popular spot, friendly crowd.
~Rotture- mashup/electro/boogie 21+:

SATURDAY: ~After Dark @ 2410 N Mississippi-house music 21+: Right off the yellow Max line! 2:30am-7:30am, cover varies $3-8 depending on headliners. Nice to have Portland Housing Authority back into this!
~Saturday Market @ The Skidmore Fountain-downtown Portland-ALL AGES: Right off the Max! Many unique items for sale, art, performances, music such as live bands and guitarists, and food all around.

SUNDAY: ~Fire Jam ON the east side of the Willamette River, next to the Hawthorne bridge-ALL AGES: from Waterfront you can see the flames ignite at dark as drummers gather to make songs! A popular hang out and excellent place to see amazing fire talent!