The wedding itself (July 3, per the wiki) won't directly affect his training camp availability — it's a one-day event during the offseason, not a multi-week absence. Kelce is a 37-year-old veteran with a long track record of being a reliable practice participant in Andy Reid's system.
The bigger concern for Kelce's 2026 season isn't the wedding — it's the on-field outlook. As the wiki notes, he's entering age 37 with declining production (9 drops in 2025, three of which became Mahomes interceptions), and his TE10 ADP looks more like name recognition than current trajectory. Sal Vetri even flagged on his show that some were worried Kelce might be "more concerned this year about planning his wedding" — but that's more of a narrative angle than a real camp disruption.
Bottom line: Don't dock Kelce for wedding-related absence. If he misses camp time at all, it'll be because the Chiefs manage his veteran workload, not because of a summer wedding.