The Montreal Botanical Garden celebrates the approaching summer season with the Great Gardening Weekend, launching today with an opportunity to visit the gardens for free (today only), plus the chance to purchase seedlings and gardening accessories plus learn tips and tricks from the city’s horticultural community. 4101 Sherbrooke E., 9 a.m.–6 p.m., free
Osheaga launches terrasse season in style with a weekend-long outdoor concert in the Latin Quarter, with a line-up of local bands Radiant Baby, Heat, Ghostly Kisses, Danny Laj and the Looks, Wake Island and more. St-Denis between Sherbrooke and de Maisonneuve, 3–11 p.m. Friday and Saturday
The sixth edition of comics and graphic arts event Festival BD (Bande-Dessinée) features meet & greets, signings, workshops and exhibitions with many of Montreal’s favourite graphic storytellers, today through Sunday. Espace LaFontaine (3933 Parc-La Fontaine), 1–7 p.m. Fri, 10 a.m.–6 p.m. Sat, 10 a.m.–5 p.m. Sun, free
Plateau live music venue Café Campus celebrates 50 years of shows this year, and helping them celebrate tonight will be local multi-lingual hip-hop group Nomadic Massive with some special surprise guests. 57 Prince-Arthur E., 9 p.m., $15/$12 in advance
For more concert recommendations, see this week’s edition of Hammer of the Mods.