Meeting on the meadow near WI Mainz-Kastel Bahnhof. (NOT downtown Mainz!)
From Frankfurt:
Take A66 to B455 in Wiesbaden.
Take exit 6-Wiesbaden-Erbenheim to merge onto B455 toward Mainz-Kastel / Wiesbaden-Erbenheim-Süd
Follow B455 to Rheinufer
Go through 1 roundabout
At the roundabout, take the 3rd exit onto Philippsring / B40
Turn next right onto Rheinufer
GPS: 50.010725, 8.278496