Running euchre for 17
For 17 players you will need 4 tables, 4 euchre decks (9 up to ace), and 5 sheets of paper for the score cards (four to a page). With 16 or 20 players nobody would sit out.
Give each guest a number as they arrive. Each round, find your number: the pair before the "v" sits North and South, the pair after sits East and West, so partners face each other. Many parties play 8 hands a round, then everyone writes their team's points on their card and moves when the host calls time.
Sit-outs can't come out exactly even over 12 rounds: 5 people never sit out and the rest sit out once. Play 17 rounds if you want everyone to sit out the same number of times.
Each score card lists that player's table, partner and opponents for every round. Want names on them, a different number of rounds or a fresh shuffle? Open this chart in the planner.