Looks like Marvel Snap will reward players for participating in the Gamescom Opening Night starting on the 22nd of August. I noted the following message on their discord.

GAMESCOM OPENING NIGHT LIVE 2023

Get a Free Spider-Man Card and Avatar when you watch!

Tune into Gamescom Opening Night Live 2023 starting on August 22nd at 11AM PT for a special MARVEL SNAP announcement. Earn AWESOME rewards while you’re watching the main stream OR any Special Events co-stream on Twitch! Just make sure your Twitch and MARVEL SNAP accounts are linked and watch for 30 minutes to unlock rewards:

● Spider-Man Card illustrated by Max Grecke

● Spider-Man Avatar illustrated by Max Grecke

● 65 Spider-Man boosters to level up your card! Already have Spider-Man Variant by Max Grecke in your Collection? No worries! You’ll receive a whopping 1200 Gold instead.

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Details:

Start: Tuesday, August 22nd at 11 AM PT End: Concludes with the end of Opening Night Live broadcast

Where to Watch: https://www.twitch.tv/thegameawards or any Special Events stream co-streaming Opening Night Live!

Link Your Accounts: https://www.marvelsnap.com/twitchdrops

How to Claim: Log into your MARVEL SNAP linked account to claim your rewards via Inbox! Make sure you login and claim your ONL Twitch Drops before Aug 25th! Twitch Drops unlocked during Opening Night Live will no longer be available to collect after August 25th.