A round of the Regional Climbing Youth Cup, the Flemish bouldering series for young climbers in the U11 to U19 categories. Sign up in advance on Etto Climbing, or at the hall from 09:00; the fee is paid on the day. Klimkaffee lists it as the ABC Youth Cup.
As Klimkaffee Mechelen announced it. Plans change, so check with the wall before you go. Something wrong? Let us know.
€15
Klimkaffee's Halloween party: 20 new routes to climb in costume, a costume contest with a month's membership as the prize, then dancing to Party Roulette.
A 24-hour climb for De Warmste Week: Klimkaffee gives €0.10 to the charity drive for every route climbed and logged. Normal entry applies.
A second-hand sale of climbing and outdoor gear: Klimkaffee clears out its lost property, and anyone can bring their own shoes, crash pads, packs and other kit to sell.
€25
Klimzaal Blok, Antwerp, Belgium20 km away
Blok's big annual bouldering comp, with qualifying waves through the day for youth, amateur and pro climbers, a final from 20:30 with a DJ, and an afterparty. The hall is closed on 22 and 23 October while the problems are set.

€5 if you wear glitter
Beest Boulders Antwerpen, Antwerp, Belgium24 km away
An ABBA-themed evening of climbing and dancing under disco lights. Entry is €5 for anyone who turns up wearing glitter.

Klimzaal De Stordeur, Leuven, Flemish Brabant, Belgium20 km away
A stop on Blue Ice's harness demo tour, where climbers can try the Vista and Cuesta harnesses on the wall. The time hasn't been announced; the tour's stop at Klimax ran from 17:00.

Pink Peaks, Grimbergen, Flemish Brabant, Belgium16 km away
A Halloween night of UV climbing and lead climbing: come in fancy dress and get a free drink.
Evolution Verticale, Woluwe-Saint-Lambert, Brussels-Capital Region, Belgium21 km away
An evening session with the lights turned off: climbing in the dark by head torch, with fancy dress encouraged.

Free entry in costume
Arkose Canal, Brussels, Brussels-Capital Region, Belgium20 km away
Arkose Canal goes Halloween from 18:00, with a decorated hall, costumes, a raffle and Halloween drinks at the bar. Climb or just come for the evening; entry is free if you come in costume, though shoe hire is extra.
